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-   -   PCI-e 2.0 card in a PCI-e 1.0a Slot... Max Speed? (http://www.techist.com/forums/f75/pci-e-2-0-card-pci-e-1-0a-slot-max-speed-228986/)

cwiz 04-12-2010 06:56 PM

PCI-e 2.0 card in a PCI-e 1.0a Slot... Max Speed?
 
I have a HD 3850 in my older MSI K8N Neo4-F motherboard with an amd x2 3800+ and 2gb of ddr 400 ram and a ~600w psu with a beefy 12V rail so i'm not worried about being short on power... i'll repost when i get home with actual numbers

It kinda sucks compared to the super-clocked 7900GT I had in there before it fried :( Volt mods are fun but they dont last for ever!

According to wikipedia, most PCI-e 2.0 cards are compatable with older PCI-e 1.0 slots. This is good news for me, but the catch is that the newer card can't run any faster than the 250 MB/s data rate and 2.5 GT/s transfer rate (max speed for pci-e 1.0)

So my question is, how do I know when a newer card will be maxing out the speed of my old PCI-e 1.0a x16 slot?

I want to keep the cost under $150 so I've been looking at the GTS 250 and HD 4850. Any idea what rates these cards run at? Can I go for a better card?

Yami 04-12-2010 09:01 PM

Re: PCI-e 2.0 card in a PCI-e 1.0a Slot... Max Speed?
 
An HD4850 won't be impeded by the lower transfer rate - neither will a GTS250. Only recently have cards started to saturate even 1.0.

Baez 04-13-2010 01:32 AM

Re: PCI-e 2.0 card in a PCI-e 1.0a Slot... Max Speed?
 
The number of lanes is more important than the PCI-e version for now. A GTX 480 running in a PCI-e x16 slot but in x4 mode is not a good mix.

cwiz 04-13-2010 03:26 PM

Re: PCI-e 2.0 card in a PCI-e 1.0a Slot... Max Speed?
 
why would my pci-e 1.0 x16 be running in 4x mode? isn't it default running at 16x?

Yami 04-13-2010 05:28 PM

Re: PCI-e 2.0 card in a PCI-e 1.0a Slot... Max Speed?
 
He's not saying yours would, it's just one of the main considerations now.

For example, the P55 chipset (for i5 and i3 processors) has two PCI-E x16 slots - however there are only 16 'lanes' to the CPU so if you have multiple video cards then they both have to run at x8 speed (half).


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