Lenovo Desktop Computers for Sale in Johannesburg CBD

On Promotion in Electronics

Pay & Ship

Buy with confidence. Secure payment options & nationwide delivery. Learn more

Filter & refine

Clear All

Johannesburg CBD
Lenovo
CategoryLenovo
- All Categories
- Electronics
- Computers & Laptops
- Desktop Computers
- Lenovo32
LocationJohannesburg CBD
- South Africa
- Gauteng
- Johannesburg
- Johannesburg CBD32
Price
R
-
R
For Sale ByAny
- Owner32
Price TypeAny
- Amount32
RAM SizeAny
- 4 GB - 8 GB1
- 8 GB - 16 GB21
- 16 GB - 32 GB8
- Over 64 GB2
CPU TypeAny
- Intel14
ConditionAny
- New4
- Used28
Payment
Payment
Filter your search to see items that you can buy online immediately using our secure and easy payment facility.
Learn more
Any
- Online payment
Delivery
Delivery
When you buy online you can choose between having your item delivered to you from anywhere in the country or for you to arrange collection so you can view the item before finalising the deal.
Learn more
Any
- Nationwide Delivery
- Collection
Sort byMost Recent
- Most Recent
- Low Prices
- High Prices

Results for Lenovo Desktop Computers for Sale in Johannesburg CBD in Johannesburg CBD

Lenovo ThinkCentre neo 50t Gen 3 Desktop PC - i5-12400,16GB RAM,512GB SSD, Windows 11 ProGRADE

R 6,500

SavedSave

Lenovo ThinkCentre neo 50t Gen 3 Desktop PC - i5-12400,16GB RAM,512GB SSD, Windows 11 ProGRADE

Specifications-Product: Lenovo ThinkCentre neo 50t-Chassis type: Tower-Form factor: Desktop Tower-Product type: PC-Processor family: 12th Generation Intel® Core™ i5-Processor model: i5-12400 (18M Cache, up to 4.40 GHz)-Processor frequency: 2.50 / 4.40 GHz-Internal memory: 16 GB-Internal memory type: DDR4-SDRAM-Memory clock speed: 3200 MHz-Total storage capacity: 512 GB-Storage media: SSD-On-board graphics card model: Intel® UHD Graphics 730-Operating system installed: Windows 11 Pro-Operating system architecture: 64-bit-Weight: 6.75 kg-Product colour: BlackInterested clients can call me on 0726206267 or visit our shop ( A GLOBAL TECHNOLOGIES), at 123 Commissioner street Marshall Town, Opposite THE BROOKLYN, You can view our shop on google (https://share.google/f4L2i1cPqvoj47xnq) and website( https://aglobaltechnologies.co.za)our working hours are from 7am to 5pm Mondays to Saturdays Your sales person Nonhlanhla

1mo

Johannesburg CBD

R 6,500

NEGOTIABLE

SavedSave

Lenovo ThinkCentre neo 50t Gen 3 Desktop PC - i5-12400,16GB RAM,512GB SSD, Windows 11 ProGRADE

Lenovo ThinkCentre neo 50t Gen 3 Desktop PC - i5-12400,16GB RAM,512GB SSD, Windows 11 ProGRADE Interested clients can call me on 0694293931/0113540017 or Delivery can be made via the courier guy once purchase has been made. you can visit our main branch in CBD at 113 Main street, Marshall Town shop N03 ground floor MATHOMO MALL Opposite Gym Company or you can app us or call us on 0848531001/0113540017 our shop is also on Google you can Google map our New Branch INFOTECH132 COMPUTER SHOP note Your sales person Mbali You can visit us at www.infotechcomputers.co.za.

1mo

Johannesburg CBD

R 6,500

NEGOTIABLE

SavedSave

Lenovo Thinkcentre Neo 50t Gen 3 Desktop Pc - I5-12400,16gb Ram,512gb Ssd, Windows 11 Pro Grade

Lenovo ThinkCentre neo 50t Gen 3 Desktop PC - i5-12400,16GB RAM,512GB SSD, Windows 11 ProGRADEProduct: Lenovo ThinkCentre neo 50tChassis type: TowerForm factor: Desktop TowerProduct type: PCProcessor family: 12th Generation Intel® Core™ i5Processor model: i5-12400 (18M Cache, up to 4.40 GHz)Processor frequency: 2.50 / 4.40 GHzInternal memory: 16 GBInternal memory type: DDR4-SDRAMMemory clock speed: 3200 MHzTotal storage capacity: 512 GBStorage media: SSDOn-board graphics card model: Intel® UHD Graphics 730Operating system installed: Windows 11 Prointerested clients can call me on 0691946657 / 0645191482 or visit our shop ( INFOTECH ), at 113 MAIN STREET MATHOMO MALL, our working hours are from 7am to 5pm Mondays to Saturdays Your sales person ROSE

1mo

Johannesburg CBD

Lenovo ThinkCentre neo 50q G4 Intel Core i5-13420H 8GB RAM 512GB SSD Win 11 Pro Tiny Desktop PC

R 7,500

SavedSave

Lenovo ThinkCentre neo 50q G4 Intel Core i5-13420H 8GB RAM 512GB SSD Win 11 Pro Tiny Desktop PC

Technical Specifications:Product: Lenovo ThinkCentre neo 50q Gen 4Form factor: TinyProduct type: DesktopProcessor family: 13th Generation Intel Core i5Processor model: i5-13420HProcessor frequency: 3.40 / 4.60 GHz (12 MB cache, 8 cores)Internal memory: 8 GB 3200 MHz (1 x 8 GB)Internal memory type: DDR4-SDRAMTotal storage capacity: 512 GB M.2 2280 PCIe 4.0×4 NVMe Opal 2.0Storage media: SSDOn-board graphics card model: Intel UHD GraphicsKeyboard and Mouse: USB English (EU) Keyboard and Mouse ComboPower supply: 65W 89% AdapterCard Reader: No card readerOptical drive: NoneConnectivity: Intel Wi-Fi 6 AX201 + Bluetooth 5.1Mounting: 1x VESA MountStand: Not includedOperating system installed: Windows 11 P..interested clients can call me on 0726206267 or visit our shop ( A GLOBAL TECHNOLOGIES), at 123 Commissioner street Marshall Town, Opposite THE BROOKLYN, You can view our shop on google (https://share.google/f4L2i1cPqvoj47xnq) and website( https://aglobaltechnologies.co.za)our working hours are from 7am to 5pm Mondays to Saturdays Your sales person Nonhlanhla

1mo

Johannesburg CBD

Lenovo Think Centre M70s Desktop PC ,Core i5-10th Gen ,8GB RAM, 256GB SDD,Win 11 Pro New

R 6,000

SavedSave

Lenovo Think Centre M70s Desktop PC ,Core i5-10th Gen ,8GB RAM, 256GB SDD,Win 11 Pro New

Lenovo Think Centre M70s Desktop PC ,Core i5-10th Gen ,8GB RAM, 256GB SDD,Win 11 Pro New in the Boxinterested clients can call me on 0691946657 / 0645191482 or visit our shop ( INFOTECH ), at 113 MAIN STREET MATHOMO MALL, our working hours are from 7am to 5pm Mondays to Saturdays Your sales person ROSE

2mo

Johannesburg CBD

Lenovo Think Centre M70s Desktop PC ,Core i5-10th Gen ,8GB RAM, 256GB SDD,Win 11 Pro

R 15,000

SavedSave

Lenovo Think Centre M70s Desktop PC ,Core i5-10th Gen ,8GB RAM, 256GB SDD,Win 11 Pro

Lenovo Think Centre M70s Desktop PC ,Core i5-10th Gen ,8GB RAM, 256GB SDD,Win 11 ProProduct: Dell Latitude 5450Product type: LaptopForm factor: ClamshellProcessor family: Series 1 Intel Core Ultra 5Processor model: 135U vProProcessor frequency: 1.10 / 4.40 GHz (12MB Cache, 12 Cores)NPU: Intel AI Boost, up to 11 TOPSDisplay diagonal: 35.6 cm (14")HD type: Full HDDisplay resolution: 1920 x 1080 pixelsDisplay: Non-Touch, 60Hz, IPS, AG, 250 nits, 45% NTSCInternal memory: 32 GB 5600 MHz (2 x 8 GB)Internal memory type: DDR5-SDRAMTotal storage capacity: 512 GB M.2 2230 PCIe NVMe TLC G4Storage media: SSDOn-board graphics card model: Intel GraphicsKeyboard: English International, Backlit with AI HotkeyCamera: FHD HDR IR, ExpressSign-In, No Intelligent Privacy, TNR, Camera ShutterFingerprint reader: Not SupportedOperating system installed: Windows 11 Prointerested clients can call me on 0691946657 / 0645191482 or visit our shop ( INFOTECH ), at 113 MAIN STREET MATHOMO MALL, our working hours are from 7am to 5pm Mondays to Saturdays Your sales person ROSE

2mo

Johannesburg CBD

Lenovo Thinkcentre M70q Gen 4 core I5-13400t @1.30 Ghz16gb Ram, 256gb Ssd

R 7,000

SavedSave

Lenovo Thinkcentre M70q Gen 4 core I5-13400t @1.30 Ghz16gb Ram, 256gb Ssd

LENOVO THINKCENTRE M70Q Gen 4CORE i5-13400T@1.30 GHZ16GB RAM, 256GB SSD WINDOWS 10 PRO Lenovo Tiny M70q Gen 3 Desktop PC 13th Generation Intel Core i5-13400T Processor (20M Cache, up to 4.40 GHz), 16GB DDR4 3200MHz RAM, 512GB NVMe 4.0×4 Opal 2.0 Solid State Drive, No Optical Drive, Integreted Intel UHD Graphics 730, 1 x 2W HD Speakers, Intel AX201, 11ax 2×2 + Bluetooth 5.1, Connectivity: Front Ports: 1 x USB 3.2 Gen 2, 1 x USB 3.2 Gen 2 (Always On and 5V@2.1A charging), 1 x USB-C 3.2 Gen 1 (support data transfer and 5V@0.9A charging), 1 x headphone / microphone combo jack (3.5mm), Rear Ports: 1 x HDMI 2.1 TMDS, 1 x DisplayPort 1.4, 1 x USB 2.0, 1 x USB 3.2 Gen 1, 2 x USB 3.2 Gen 2, 1 x Ethernet (RJ-45), USB windows 11 pro interested clients can call me on 0691946657 / 0645191482 or visit our shop ( INFOTECH ), at 113 MAIN STREET MATHOMO MALL, our working hours are from 7am to 5pm Mondays to Saturdays Your sales person ROSE

3mo

Johannesburg CBD

Lenovo ThinkCentre M710q Tiny Pc Core i5-7th gen 8GB Ram 256GB SSD win10

R 2,600

NEGOTIABLE

SavedSave

Lenovo ThinkCentre M710q Tiny Pc Core i5-7th gen 8GB Ram 256GB SSD win10

Lenovo ThinkCentre M910q Tiny Intel® Core i5 i5-7500 8 GB DDR4-SDRAM 256 GB SSD Windows 11 Mini PC Black: Mini PC Black 65 WIntel® Core i5 i5-7500T 2.5 GHz Processor cores: 4 8 GB DDR4-SDRAM 2400 MHz 1 x 8 GB 256 GB SSD Intel® HD Graphics 530 Ethernet LAN 10,100,1000 Mbit/s Wi-Fi 5 (802.11ac) Bluetooth 4.1Windows 11

3mo

Johannesburg CBD

Lenovo ThinkCentre M70q Gen 5 Tiny Desktop, Core i5-14400T,(14th Gen)16GB RAM, 256GB SSD

R 8,500

SavedSave

Lenovo ThinkCentre M70q Gen 5 Tiny Desktop, Core i5-14400T,(14th Gen)16GB RAM, 256GB SSD

Desktop, Core i5-14400T,(14th Gen)16GB RAM, 256GB SSD,Windows 11 Pro New out of the boxinterested clients can call me on 0691946657 / 0645191482 or visit our shop ( INFOTECH ), at 113 MAIN STREET MATHOMO MALL, our working hours are from 7am to 5pm Mondays to Saturdays Your sales person ROSE

3mo

Johannesburg CBD

Lenovo Thinkcentre M910z All In One Desktop Intel,core I5-7th Gen,8gb Ram,1tb Hdd, Preowned

R 4,000

SavedSave

Lenovo Thinkcentre M910z All In One Desktop Intel,core I5-7th Gen,8gb Ram,1tb Hdd, Preowned

Lenovo ThinkCentre M910z All in One Desktop Intel,Core i5-7th Gen,8GB RAM,1TB HDD, PREOWNED Lenovo ThinkCentre M910z All in One DesktopIntel Core i5-7th Gen8GB Memory1TB Hard Drive23.8″ FHD Screen Display2 x USB 3.0 (1 always on/rapid charge) Ports4 x USB 3.0 PortsHeadphone & Mic combointerested clients can call me on 0691946657 / 0645191482 or visit our shop ( INFOTECH ), at 113 MAIN STREET MATHOMO MALL, our working hours are from 7am to 5pm Mondays to Saturdays Your sales person ROSE

4mo

Johannesburg CBD

Lenovo ThinkCenter m720qVga port✅Display port ✅Hdmi port✅3.0 usb port✅Core i5 8th gen 8gb ram 256 ss

R 4,000

SavedSave

Lenovo ThinkCenter m720qVga port✅Display port ✅Hdmi port✅3.0 usb port✅Core i5 8th gen 8gb ram 256 ss

Lenovo ThinkCenter m720qVga port✅Display port ✅Hdmi port✅3.0 usb port✅Core i5 8th gen 8gb ram 256 ssdR4000CONTACT MELBY ON 071 712 6482

4mo

Johannesburg CBD

Lenovo Thinkcentre M75q Gen 5, Amd Ryzen 5 Pro 8500ge,16gb Ram, 256gb Ssd M.2 2280 Pcie Gen4

R 7,500

SavedSave

Lenovo Thinkcentre M75q Gen 5, Amd Ryzen 5 Pro 8500ge,16gb Ram, 256gb Ssd M.2 2280 Pcie Gen4

LENOVO ThinkCentre M75q Gen 5, AMD Ryzen 5 PRO 8500GE,16GB RAM, 256GB SSD M.2 2280 PCIe Gen4 ThinkCentre M75q Gen 5, AMD Ryzen 5 PRO 8500GE (3.40GHz, 16MB), Windows 11 Pro 64, 16.0GB, 1x256GB SSD M.2 2280 PCIe Gen4 TLC Opal, AMD RadeonBrand LenovoOperating System Windows 11 ProCPU Model Ryzen 5CPU Speed 3.4 GHzGraphics Card Description IntegratedGraphics Coprocessor AMD Radeon 740MMemory Storage Capacity 16 GBSpecific Uses For Product BusinessRam Memory Installed Size 16 GBStorage 256GB SSD M.2its available sir, you can visit our main branch in CBD at 113 Main street, Marshall Town shop N03 ground floor MATHOMO MALL Opposite Gym Company or you can app us or call us on 0691946657/0113540017 our shop is also on google you can google map our New Branch INFOTECH132 COMPUTER SHOP note: our items covers a 6 months warranty from purchase date. Delivery can be made via the courier guy once purchase has been made. You can us on www.infotechcomputers.co.za. Your sales Person Rose

4mo

Johannesburg CBD

Lenovo Thinkcentre V30A-22iil AIO Core i5-1035G1(10th Gen ) 8GB RAM ,256GB SSD 21.5"inch

R 6,000

NEGOTIABLE

SavedSave

Lenovo Thinkcentre V30A-22iil AIO Core i5-1035G1(10th Gen ) 8GB RAM ,256GB SSD 21.5"inch

Lenovo Thinkcentre V30A-22iil AIO Core i5-1035G1(10th Gen ) 8GB RAM ,256GB SSD 21.5"inch ,PREOWNED AVAILABLE IN STOCK Interested clients can call me on 0694293931/0113540017 or Delivery can be made via the courier guy once purchase has been made. you can visit our main branch in CBD at 113 Main street, Marshall Town shop N03 ground floor MATHOMO MALL Opposite Gym Company or you can app us or call us on 0848531001/0113540017 our shop is also on Google you can Google map our New Branch INFOTECH132 COMPUTER SHOP note Your sales person Mbali You can visit us at www.infotechcomputers.co.za.

5mo

Johannesburg CBD

R 6,000

SavedSave

Lenovo Thinkcentre V30A-22iil AIO Core i5-1035G1(10th Gen ) 8GB RAM ,256GB SSD 21.5"inch

Lenovo Thinkcentre V30A-22iil AIO Core i5-1035G1(10th Gen ) 8GB RAM ,256GB SSD 21.5"inch,PREOWNED21.5" displayNon Touch DisplayIntel Core i5 1035G1 ProcessorIntel Embedded Graphics256GB SSD Storage 8GB RAM Windows 10 ProSilver & BlackPerfect all in one desktop for home use including Spreadsheets, Word processing and Web Browsing.interested clients can call me on 0691946657 / 0645191482 or visit our shop ( A GLOBAL TECHNOLOGIES), at 126 Commissioner street Marshall Town, Opposite THE BROOKLYN, (https://maps.app.goo.gl/s1id7sGe92EDZBWn9) our working hours are from 7am to 5pm Mondays to Saturdays Your sales person ROSE

5mo

Johannesburg CBD

R 7,500

SavedSave

Lenovo Thinkcentre M75q Gen 5, Amd Ryzen 5 Pro 8500ge,16gb Ram, 256gb Ssd M.2 2280 Pcie Gen4

LENOVO ThinkCentre M75q Gen 5, AMD Ryzen 5 PRO 8500GE,16GB RAM, 256GB SSD M.2 2280 PCIe Gen4 Form Factor: Tiny (1L)• Operating System: Windows 11 Pro• Processor: AMD Ryzen 5 8500GE (6C / 12T, 3.4 / 5.0GHz, 6MB L2 / 16MB L3)• Memory: 2x 8GB SO-DIMM DDR5-5200• Storage: 256GB SSD M.2 2280 PCIe 4.0x4 NVMe Opal 2.0• Graphics: Integrated AMD Radeon 740M• Optical drive: None• Interfaces: Front Ports: 1x USB-C (USB 10Gbps / USB 3.2 Gen 2), with 5V@0.9A charging, 1x USB-A (USB 10Gbps / USB 3.2 Gen 2), with Always On and 5V@2.1A charging, 1x USB-A (USB 10Gbps / USB 3.2 Gen 2), 1x headphone / microphone combo jack (3.5mm)• Interfaces: Rear Ports: 1x USB-A (USB 10Gbps / USB 3.2 Gen 2), 3x USB-A (Hi-Speed USB / USB 2.0), 1x HDMI 2.1 TMDS, 1x DisplayPort 1.4 (HBR2, DSC), 1x Ethernet (RJ-45)• Bluetooth: BT5.3• Wireless LAN: Realtek Wi-Fi 6 RTL8852BE, 802.11ax 2x2• Power Supply: 65W 89% Adapter• Audio: High Definition (HD) Audio, Realtek ALC233 codec• Keyboard: USB Traditional Keyboard, Black, English• Pointing device: USB Calliope Mouse, Black• Colour: Blackinterested clients can call me on 0691946657 / 0645191482 or visit our shop ( A GLOBAL TECHNOLOGIES), at 126 Commissioner street Marshall Town, Opposite THE BROOKLYN, (https://maps.app.goo.gl/s1id7sGe92EDZBWn9) our working hours are from 7am to 5pm Mondays to Saturdays Your sales person ROSE

5mo

Johannesburg CBD

Lenovo Tbinkstation P710 Mt,2x Xeon(r)e5-2680v4, 192 Gb Ram, 512gb Ssd ,nvidia Quadro P5000 16gb

R 11,000

NEGOTIABLE

SavedSave

Lenovo Tbinkstation P710 Mt,2x Xeon(r)e5-2680v4, 192 Gb Ram, 512gb Ssd ,nvidia Quadro P5000 16gb

Lenovo Tbinkstation P710 MT,2x XEON(R)E5-2680v4, 192 GB RAM, 512GB SSD ,NVIDIA QUADRO P5000 16GB PREOWNED its available sir/Madam, you can visit our main branch in CBD at 113 Main street, Marshall Town shop N03 ground floor MATHOMO MALL Opposite Gym Company or you can app us or call us on 0694293831/0113540017 our shop is also on Google you can Google map our New Branch INFOTECH132 COMPUTER SHOP note: our items covers a 6 months warranty from purchase date. Delivery can be made via the courier guy once purchase has been made. You can Visit us at www.infotechcomputers.co.za.YOURS YOUR SALES PERSON Mbali

6mo

Johannesburg CBD

R 11,000

SavedSave

Lenovo Tbinkstation P710 MT

Lenovo Tbinkstation P710 MT,2x XEON(R)E5-2680v4, 192 GB RAM, 512GB SSD ,NVIDIA QUADRO P5000 16GB PREOWNED interested clients can call me on 0691946657 / 0645191482 or visit our shop ( A GLOBAL TECHNOLOGIES), at 126 Commissioner street Marshall Town, Opposite THE BROOKLYN, (https://maps.app.goo.gl/s1id7sGe92EDZBWn9) our working hours are from 7am to 5pm Mondays to Saturdays Your sales person ROSE

6mo

Johannesburg CBD

Lenovo Thinkcentre M93p, Core I5 4th Gen, 8gb Ram 128gb Ssd Certified Refurbished

R 2,000

NEGOTIABLE

SavedSave

Lenovo Thinkcentre M93p, Core I5 4th Gen, 8gb Ram 128gb Ssd Certified Refurbished

Lenovo Thinkcentre M93p, Core i5 4th Gen, 8GB RAM 128GB SSD CERTIFIED REFURBISHED Interested clients can call me on 0694293931/0113540017 or Delivery can be made via the courier guy once purchase has been made. you can visit our main branch in CBD at 113 Main street, Marshall Town shop N03 ground floor MATHOMO MALL Opposite Gym Company or you can app us or call us on 0848531001/0113540017 our shop is also on Google you can Google map our New Branch INFOTECH132 COMPUTER SHOP note Your sales person Mbali You can visit us at www.infotechcomputers.co.za.

6mo

Johannesburg CBD

Lenovo Thinkcentre M93p, Core i5 4th Gen, 8GB RAM 128GB SSD

R 2,000

SavedSave

Lenovo Thinkcentre M93p, Core i5 4th Gen, 8GB RAM 128GB SSD

Lenovo Thinkcentre M93p, Core i5 4th Gen, 8GB RAM 128GB SSD CERTIFIED REFURBISHED- Processor: Intel Core i5-4TH GENERATION (2.8GHz)- Operating System: Microsoft Windows 10 PRO- Memory: 8GB DDR3 RAM- Storage 128 GB SSD (NEW)- Network Interface: 10/100/1000 Gigabit Ethernet- Dimensions: 18.3cm x 1.8cm x 17.8cm- Weight: 3.3kg- Form Factor: Micro Form Factorinterested clients can call me on 0691946657 / 0645191482 or visit our shop ( A GLOBAL TECHNOLOGIES), at 126 Commissioner street Marshall Town, Opposite THE BROOKLYN, (https://maps.app.goo.gl/s1id7sGe92EDZBWn9) our working hours are from 7am to 5pm Mondays to Saturdays Your sales person ROSE

6mo

Johannesburg CBD

Lenovo Neo 50s G4 Intel Core i5-13400 13TH GEN,8GB RAM DDR4, 512GB SSD Win 11 Pro SFF

R 6,500

SavedSave

Lenovo Neo 50s G4 Intel Core i5-13400 13TH GEN,8GB RAM DDR4, 512GB SSD Win 11 Pro SFF

Lenovo Neo 50s G4 Intel Core i5-13400 13TH GEN,8GB RAM DDR4, 512GB SSD Win 11 Pro SFF Product: Lenovo ThinkCentre neo 50sChassis type: SFF (7.4L)Product type: PCProcessor family: 13th Generation Intel Core i5Processor model: i5-13400Processor frequency: 2.50 / 4.60 GHz (20MB Cache, 10 Cores)Internal memory: 8 GB 3200 MHz UDIMM (1x 8 GB)Internal memory type: DDR4Total storage capacity: 512 GB M.2 2280 PCIe 4.0×4 NVMe Opal 2.0Storage media: SSDinterested clients can call me on 0691946657 / 0645191482 or visit our shop ( A GLOBAL TECHNOLOGIES), at 126 Commissioner street Marshall Town, Opposite THE BROOKLYN, (https://maps.app.goo.gl/s1id7sGe92EDZBWn9) our working hours are from 7am to 5pm Mondays to Saturdays Your sales person ROSE

6mo

Johannesburg CBD

Save this search and get notified

when new items are posted!

Lenovo Desktop Computers for Sale in Johannesburg CBD

Lenovo Desktop Computers for Sale in Johannesburg CBD in Johannesburg CBD (32 results)

Results for Lenovo Desktop Computers for Sale in Johannesburg CBD in Johannesburg CBD