Member Avatar for daxie

Would appreciate a fast reply on this one, guys.

I have a PC with a DG35EC mobo, C2Q Q6600 2.4GHZ processor, 4GB DDR2 800MHz RAM, 500GB Seagate HDD, running on 64-bit Windows 7 Ultimate. The PSU is a Prime Source Tech AX-400S with +3.3V - 30.0A, +5V - 28.0A, +12V1 - 14.0A, +12V2 - 16.0A, -12V - 0.5A, +5VSB - 2.5A. I have now brought a XFX HD 4670 1GB DDR3 card (had a 8500GT before which worked great). My PC refuses to recognize the card and boots up straight to Win7 using onboard graphics. After being through many sites and forums, it seems that voltage might be the problem but have also read that PSUs of 350w (with a collective amperage of 18 on two 12v rails) are able to run the card with not much of a problem and I am assuming that my PSU should be more than enough to power the GPU with 30A (12V1 + 12V2), which is just not happening. Any help would be appreciated as I am planning to return the card tomorrow!

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  • Latest Post Latest Post by priyanshu14

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Most failures like this come down to three practical things: the monitor/cable still on the onboard port or BIOS still using integrated video, the card not getting proper power/seat, or the PSU not delivering stable 12V under load. was right to check the display cable and the presence of any VGA/BIOS text — if you never see the card's POST/splash the problem is at the hardware/BIOS handoff level, not Windows drivers.

Quick troubleshooting checklist you can run before returning the card:

  • Move the monitor cable to every output on the new card (and try a DVI/HDMI digital feed if available). If using a DVI->VGA adapter, confirm the card's DVI is analog-capable; digital-only DVI will show no BIOS screen on a VGA-only monitor.
  • Reseat the card fully, lock the PCIe latch, and try a different slot if the board has one. Blow dust out of the slot and clean the card contacts.
  • Look in BIOS for "Primary Display" / "Init Display First" and choose PCIe/PEG, or temporarily disable the integrated GPU. Clearing CMOS can help if the board refuses to detect a new adapter.
  • Verify any auxiliary PCIe power leads are connected if the card has them. If not, still check that the slot receives power (card fans/spin can be misleading).
  • Test the card in a second PC, and test a known-good card in this PC to isolate card vs. motherboard/PSU.

About the PSU: rated amps on a label are not always what you get under load, and rail splitting can matter. As and suggested, try a known-good, higher-quality supply before assuming incompatibility. If the card works in another machine, replace or upgrade the PSU; if it never POSTS anywhere, arrange an RMA for the card.

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Member Avatar for Xlphos

Hello,

So you installed the graphics card. Removed the display cable from the onboard connection, attached it to the graphics card connection and the display doesn't come on?

Does the computer show any VGA BIOS information?

Member Avatar for saxmaster49

Make sure your actually running the card off the correct rails, also check the efficiency rating of the psu and multiply it by the amperage rating (that gives you the real output)

Member Avatar for priyanshu14

just refer to the radeon website for recommended power supplies. Or just try reconnecting the card and rebooting and download all latest updates..make sure you dont overclock because your powersupply is quite weak

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