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GTX 470 in a PCI-E x16 slot.

post #1 of 8
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My GTX 470 should be here on wed, but I just realized my mobo's PCI-E slot is NOT 2.0. What kind of effect will that have?
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post #2 of 8
Quote:
Originally Posted by Infinitegrim View Post
My GTX 470 should be here on wed, but I just realized my mobo's PCI-E slot is NOT 2.0. What kind of effect will that have?
This link shows a 2% loss for a GTX480:
http://www.techpowerup.com/reviews/N...caling/24.html

This link shows an 8% loss for a GTX480:
http://www.tomshardware.com/reviews/...x4,2696-9.html

So, for your GTX470, expect the performance loss somewhere between 2% and 8%. As a 470 is slightly weaker than a 480, I reckon the loss will be closer to lower end of 2%.
post #3 of 8
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post #4 of 8
I wouldn't worry about it at all. As mentioned by the previous poster, the impact is negligible. To put it in perspective, a PCI-E x16 is essentially a PCI-E 2.0 x8 slot. HardOCP found that a pair of 480s in SLI see no noticeable impact between 2.0 x16/x16 and x8/x8. Then they tried again and found that there was no noticeable impact between 2.0 x16/x16 and x4/x4. So even if you had a PCI-E (not 2.0) x8 slot, you wouldn't need to worry.
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post #5 of 8
none with a 470, since TWO 480s see almost no loss.
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post #6 of 8
even with a pci-E x4 your still fine.
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post #7 of 8
I reckon the 3 sites (TechPowerUp, Tom's, HardOCP) quoted above have, more or less, established the upper bound (8%) and the lower bound (~0%) of performance loss for a GTX470 going from a PCI-e 2.0 x16 to PCI-e 1.0 x16.

To further estimate where in this range your particular setup belongs, I scan through the results and note that the higher the resolution (and AA/AF), the less the performance loss is. At 5760x1600 and 2560x1600, the loss is practically nil. But at 1280x1024 (which is closest to your 1400x900), the loss is around 2%. And given also that yours is a 470 (vs a 480), the loss should then be even lower to, 1 - 1.5% perhaps? Not a big deal.
post #8 of 8
Quote:
Originally Posted by Nick911 View Post
even with a pci-E x4 your still fine.
I thought PCIe 4x was abit slower than AGP 8x Bandwidth wise
     
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