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PCIe2.1x16 card on PCIex16 slot HELP NEEDED !!!!!!

Last response: in Graphics & Displays
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August 23, 2011 9:17:10 AM

Has anyone ever managed to fix a PCIe 2.1 video card in a PCIe1. x16 slot ?
If yes , was there any good amount of performance degradation for a $200 graphics card ?
I m desperate to find a solution and the fact that i m from India makes it even worse since the graphic card vendors over here dont know s*** about computers :pfff: 
Please guys , throw me some light on this issue :??: 
Anyways , thanks in advance .
a c 146 U Graphics card
August 23, 2011 3:00:26 PM

There should be no noticable performance decrease, but not all 2.1 cards work in 1.0 PCIe slots. Try to find a 2.0 card instead.
August 23, 2011 3:25:09 PM

hang-the-9 said:
There should be no noticable performance decrease, but not all 2.1 cards work in 1.0 PCIe slots. Try to find a 2.0 card instead.

I searched for PCIe2.0 cards in AMD s website and it looks like they got rid of all the PCIe2.0 version cards and they roll out their new cards as PCIe2.1 version cards . I planned to get the HD 6850 and my mobo is a DG35EC . Can you help me ????
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August 23, 2011 4:06:17 PM

Yes it will !! But i guess you may have to upgrade your Psu .
August 23, 2011 4:18:36 PM

gauravtushir said:
Yes it will !! But i guess you may have to upgrade your Psu .

Yeah i m going to get a new PSU ... but wat do you think abt the PCIe compatibility ?

a c 146 U Graphics card
August 23, 2011 4:40:11 PM

The slot revision compatability is a bit touchy, there is not a set issue with 2.1 on a 1.0 slot, it depends on the card / motherboard.
a b U Graphics card
August 23, 2011 5:12:01 PM


Very hard to find a definative answer. Also some dif between ver 1.0 and ver 1.1. Also verify your Bios Version, MB manuf. may have a Bios update so that it will work. Look at latest bios update and what was "fix" by it.

Ref: cheesesubs comments
sadly it won't support pcie 1.0 or pcie 1.0a. a pcie 2.1 card would require newer chipset after g31/q965 and require pcie 1.1(at least) to run pcie 2.1 card. even so it is still having issue with some after market card and some certain amd model like 5670/5570. so called the backward compatibility is only applies to reference model in most case(nvidia) or limited to some model(amd). keep in mind these chipset under the list do not suppose pcie 2.1 despite pcie has backward compatibility. these chipset will not support pcie 2.1

nforce 4
nforce 5
p4m900/800
661fx
p865
915 all series
925x
945 all series(some card may work but not all)
ati rd580/rd600/rs600 or previous series
nforce 610i/610a/630/650
amd 690x and previous series

And from Jaquarkx
There is a difference with PCI-e 2.0 and PCI-e 2.1 cards. A PCI-e 2.0 card is backwards compatible with a PCI-e 1.0 slot. That is not the case with all PCI-e 2.1 cards. It basically boils down to if the PCI-e 1.x slot in the motherboard is properly configured or supported by the chipset.

Some motherboard manufacturers have released BIOS updates for older motherboards with PCI-e 1.x slot to be compatible with PCI-e 2.1 cards, but you have to check specifically for your motherboard.
a c 204 U Graphics card
August 23, 2011 6:52:32 PM

Your motherboard (DG35EC) should work with a current GPU (HD6850). The larger factor will be having a suitable PSU to meet the GPU's power requirements.
a b U Graphics card
August 23, 2011 6:56:37 PM

It should be backwards compatible. And the performance hit should be minimal.
August 24, 2011 4:19:19 AM

Thanks guys for your replies . Has any your friends managed to run a HD6xxx card on the DG35EC mobo ? Was it cool ?

@ RetiredChief
As far as the BIOS updates go i could not manage to find a new update .
a c 169 U Graphics card
August 24, 2011 4:52:39 AM

the only problem you may encounter is that the card will fail to run at all, some pcie1.x motherboards dont work with new cards.
August 24, 2011 6:40:16 AM

iam2thecrowe said:
the only problem you may encounter is that the card will fail to run at all, some pcie1.x motherboards dont work with new cards.


Can you suggest me some motherboards that have LGA775 socket ( 45 nm processor core2quad Q8200 2.33 Ghz)
and PCIe2.x16 graphics connector ?

!