XFX HD 7950 3Gb

Seller Note “Powers on and displays but there are artifacts on the screen so being sold as spares or repair. missing some screws as seen in the photos.”


  • Visual inspection seems like this board, although a nice sturdy unit, has a few scratches, the backplate is indeed loose and it’s a bit dirty.
  • Resistances seem OK: Vcore 1.7, Vmem 71.7
  • HDMI port quite loose, signs of corrosion around back plate.
  • On test, both fans spin, but blank screen – not artefacts as described.
  • Luckily card was cheap, it is in quite rough condition.
  • Next steps would be to take apart and check voltages.
  • Crashes windows if used as a secondary card.
  • Had broken thermal pads on memory and VRM (!Remember to replace if fixed!)
  • There is a fuse F1800 3.3v and 5v
  • Can only find 3.3v, 5v and 12v – no minor rails.

Pre Checks / Multimeter Only

Test / ChecksResultNotes
1. Visual Inspection Eye / Magnifying Glass
2. Visual Inspection Microscope
3. Check for shorts on 12v PCI, 12v PCI-E, 3.3v
4a. Resistance VCore (~0.5)Ω
4b. Resistance VMem (~60Ω)Ω
4c. Resistance 3.3v Rail (~960Ω+)
4d. Resistance 5v Rail (~5KΩ)
4e. Resistance 1v PEX Rail (~123Ω+)
4f. Resistance 12v BUS (14.7kΩ )
4g. Resistance 1.8v Rail Ω

Power On / Test Rig Checks

Tests / ChecksResultNotes
1. Observations (e.g. PCB heat noticed,
blank screen, power light on monitor,
bios screen, o/s loaded, artefacts, )
GPU cold, no minor rails.
2. Voltage VCore (~0.88v)0v
3. Voltage VMem (~1.4v)0v
4. Voltage PEX Rail (~1v)
5. Voltage 3.3 BUS3.3v
6. Voltage 12 Ext12v
6. Voltage 5v Rail5vBack of card,
7. Voltage 1.8v Rail

Component Walkthrough


  • F400 (back, near PCI EXPRESS) –
  • F1800 (back, near crossfire connecers) –

APW7165C Buck Controller:

  • U701 (back) – Pin 1 BOOT, 5 VCC, 7 COMP
  • U702 (front left, middle) – Pin 1 BOOT, 5 VCC, 7 COMP
  • U901 (front left, top) – Pin 1 BOOT, 5 VCC, 7 COMP

U4059 (front, left middle) APL5930 LDR http://images.100y.com.tw/pdf_file/38-ANPEC-APL5930.pdf – Pins:

  • 3,4 VOUT
  • 5 VIN
  • 6 VCTRL
  • 7 POK
  • 8 EN

U16 uP1608PK Multi-Phase Synchronous-Rectified Buck Controller (right, drives Vcore VRM)

Q801 PD1503YVS Dual N-Channel Enhancement MOSFET (back, near R47 inductor)