Tom's Hardware > Forum > Graphic & Displays > Graphics Cards > Crossfire, running only x4 on other card
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johli06   01-05-2009 at 02:33:47 AM

Hi there!
I use a GA-p35-DS4 which has support for two graphics cards running PCI bus x16, or so it states.
But when i plugged in a second HD 3870 card, and checking GPU-Z, it says the card is only running in x4.
Why is this? Can i change it to x16? Or what is the deal?

Kind regards in advance!

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spathotan   01-05-2009 at 02:34:41 AM
- 1 +

Limitation in the P35 chipset. 16/4 is the best you can get, which is worthless. Return the second card.


Message edited by spathotan on 01-05-2009 at 02:35:11 AM
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V3NOM   01-05-2009 at 02:38:52 AM
- 0 +

:lol: should have done some research...

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Nik_I   01-05-2009 at 02:48:45 AM
- 0 +

yep P35 is limited to 16/4. return the second card, or consider upgrading to a P45. at least that allows 8/8 in crossfire.

Reply to Nik_I
johli06   01-05-2009 at 03:46:16 AM
- 0 +

haha but then why, oh why do they say "Unbelievable power of 2 pci-e slots x16" :D damn commercialists

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weilin   01-05-2009 at 04:26:28 AM
- 0 +

to be honest, i'm surprised they didnt make it 8/8 for the p965 and p35 chipsets, but what can u do....

However, for a low end graphics card for something like physics, maybe the 4x connection is enough

Oh, and they did give u 2 16x slots... so they technically weren't lying... just "enhacing the truth"

Reply to weilin
V3NOM   01-05-2009 at 04:44:47 AM
- 0 +

its two x16 slots physically... but when both of them are used electrically they turn into x16/x4

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D3LTA09   01-05-2009 at 09:04:19 AM
- 0 +

damn do I feel like an idiot, no wonder why my cf setup is yielding such bad results I only just noticed this now. oh well was due for a mobo upgrade, So to get 2x16 in cf do I have to go to an x48 or x58 chipset?

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D3LTA09   01-05-2009 at 09:09:45 AM
- 0 +

dont worry actually already answered my question.

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