Member Avatar for mehulrock

hii everyone , i got two graphic cards
1)nvidia gforce 6600 and
2)asus 7200
i hv D955XBK motherbords in which it has given two pci xpress slots...(so that i can use both the graphic cards)
i wants two use both the graphic at the same time for better gaming experience..
plz help me how can i make that happen...
thnx a lot in advance

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  • Latest Post Latest Post by Xlphos

Dani AI

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Short answer for : you can physically run both cards at once for separate monitors, but you cannot "add" their video memory or transparently combine their 3D performance unless the system supports a vendor multi‑GPU mode and the cards are compatible. What you saw — the system reporting 512 MB and using the Asus 7200 as the renderer while the other card drives a second monitor — is exactly the expected behavior for mismatched or independently driven GPUs.

Why VRAM does not sum: GPUs keep local copies of framebuffers and textures. Even with official multi‑GPU modes the memory is mirrored, not stacked, so effective usable VRAM equals one card’s memory. That is why a second card used only for display output will not increase the amount available to games.

Practical checks and fixes:

  • Verify both cards appear in your OS (Device Manager on Windows, lspci on Linux).
  • Install vendor drivers carefully (NVIDIA and/or AMD). Mixed vendors can cause driver conflicts; keep one vendor if possible.
  • In BIOS set the primary video adapter to the slot with the card you want as the main renderer.
  • Check the motherboard manual: two PCIe slots does not automatically mean full multi‑GPU acceleration — lane allocation and explicit SLI/CrossFire support matter.
  • Ensure your PSU can handle two cards and that cards have required power connectors.
  • If your goal is better gaming performance, a single stronger card (or a matched SLI/CrossFire pair on a supported board) is usually the simplest, most effective route.

was on the right track pointing out compatibility. If keeping both for multi‑monitor use is the plan, you already have a working setup; if you want real frame‑rate gains, plan for matched cards and verify motherboard, driver, and power support first.

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Member Avatar for mehulrock

I don't think you will be able to use both these graphics cards at the same time. You need two of the same graphics cards that support SLI or Crossfire. You can buy them in sets of two that will work together; your motherboard must support it though.

hey thnx mate...
i got what u sayinn bro
i tried inserting both cards it shows that both cards hv been accepted but the thing is only one graphic card is used which is asus 7200 which shows 512mb garphic memory
another i can use for 2nd moniter display..
but both gaphic cards memory doesnt add up...which exactly i want to do..
but still thnx 4 ur help...now i dont think dat would be possible..!!

Member Avatar for Xlphos

You probably are better off just using the 7200 one as it will probably be faster. I am not sure if you can use two graphics cards at the same time though.

Problem solved then?

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