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PCI Express 3.0 graphics card in a 1.0 slot

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  • Performance
  • Graphics Cards
  • Motherboards
  • PCI Express
Last response: in Motherboards
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October 2, 2014 5:08:35 PM

I'm planning on putting an r7 260x in an old computer with a motherboard that has a PCIE x16 1.0 slot, but the graphics card is a 3.0 interface. i know they're backwards compatible, but i want to know how much, if at all, would the performance of the card drop? also if there's a specific graphics card you recommend that has similar performance to the r7 260x that would work well with a 1.0 slot. I've read that using a newer card on an older pcie slot wouldn't be able to give enough bandwidth and there could be a 15% performance decrease. others have said it'd decrease drastically and some people say there will be no performance difference.

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October 2, 2014 5:28:19 PM

There will most likely be a noticeable performance drop. May I ask what CPU you are using?
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October 2, 2014 5:48:38 PM

basdxz said:
There will most likely be a noticeable performance drop. May I ask what CPU you are using?


phenom II x4 840 3.2 ghz. i figure a 260x or 270 would be good and wouldn't bottleneck, but i could be wrong.
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October 6, 2014 8:59:44 PM

sandbox242 said:
basdxz said:
There will most likely be a noticeable performance drop. May I ask what CPU you are using?


phenom II x4 840 3.2 ghz. i figure a 260x or 270 would be good and wouldn't bottleneck, but i could be wrong.


For that CPU there might be a slight bottleneck. Since I'm using a Phenom II 955BE with R9 270, at stock clocks the processor do see maybe 2-5 fps difference compared to overclocked settings depending on the games. So if you overclock your CPU then it should be fine. But putting a PCIe 3.0 card into 1.0 slot isn't a good idea since the bandwidth isn't big enough. If you have a 2.0 slot then it wouldn't be that case. Mostly assuming in an example at 60 FPS, 1.0 slot may see as much as 5-7 fps difference in a game.

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October 7, 2014 3:25:07 PM

meat_loaf said:
sandbox242 said:
basdxz said:
There will most likely be a noticeable performance drop. May I ask what CPU you are using?


phenom II x4 840 3.2 ghz. i figure a 260x or 270 would be good and wouldn't bottleneck, but i could be wrong.


For that CPU there might be a slight bottleneck. Since I'm using a Phenom II 955BE with R9 270, at stock clocks the processor do see maybe 2-5 fps difference compared to overclocked settings depending on the games. So if you overclock your CPU then it should be fine. But putting a PCIe 3.0 card into 1.0 slot isn't a good idea since the bandwidth isn't big enough. If you have a 2.0 slot then it wouldn't be that case. Mostly assuming in an example at 60 FPS, 1.0 slot may see as much as 5-7 fps difference in a game.



well i can't overclock with the board i have, but i think the 260x will do fine.
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