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PCI-E lane question/problem

post #1 of 2
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Wasn't sure if this belonged in the motherboard or GPU section, but anyway...so I apparently didn't do put enough thought into which mobo to buy. I have an Asus P8Z77-V LK, 1 GPU, and 2 PCI-E x1 addon cards. They designed the mobo in such a way that the top x16 slot blocks the x1 slot if you put a GPU in there (why didn't they just have a normal crappy PCI slot below it instead?). That's fine I thought, I can just put the x1 in the other x16 slot. Reading the manual though, it says if the second x16 slot is occupied, then it causes both to run at 8x. I can't just move the GPU to the lower slot, because it apparently also only runs at 8x there too, even by itself.

So I guess the question is, is this a big enough deal to worry about? Currently I have a 560 TI (which is only PCI-E 2.0 capable), but I rarely upgrade my rig (went 5-6 years on the last one). It kind of ticks me off that they would design it in such a way, but I guess I should have looked into it more. They make similarly priced mobo's that aren't designed in such a bad way (Asrock, Gigabyte, etc), so I could just sell on ebay and get one of those. So what's the verdict, should I even care about this issue?

Edit: Actually I think I may have answered my own question....looking now at the manual, it seems only the first 2 slots share the same IRQ. I think if I plug my x1 into the bottom most slot, it won't cause the the drop on the GPU. Can anyone confirm? Here's the link to the manual; the page I'm looking at is page 33.

http://dlcdnet.asus.com/pub/ASUS/mb/LGA1155/P8Z77-V_LK/E7654_P8Z77-V_LK.pdf
Edited by McEgan - 5/31/13 at 11:31am
Zx
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Zx
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post #2 of 2
http://www.hardocp.com/article/2010/08/25/gtx_480_sli_pcie_bandwidth_perf_x16x16_vs_x4x4#.Ual2CrEuDtI
the difference of running @ x16 vs x4
you won't notice the difference unless you are a bencher
kamikaze
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kamikaze
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