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Worth Upgrading to 3570k from 2500k for PCI-E 3 - SLI GTX 780?

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November 4, 2013 3:20:42 PM

Hi, I'm going to purchase a GTX 780 soon for my PC which currently has a i5 2500k and a P67 motherboard. I read that the sandy bridge CPU can bottleneck a 780 through only supporting PCI-E 2.0 by around 15%, although I've read conflicting opinions and benchmarks on that.

I have a spare Z77 motherboard and was thinking it might be worth it to buy a Ivy Bridge CPU for it so I could utilize PCI-E 3.0 with this card and also benefit from the other improvements such as native USB 3. The i5 3570k looks like it would be a good replacement for this purpose, since I still want overclocking capabilities.

Within a few months I'll be upgrading to a 1440p monitor and at that time will also buy a second 780 for SLI.

The 2500k and P67 motherboard can be sold to offset the cost of the Ivy Bridge CPU. Considering all of the above, do you think it's worth upgrading my CPU and motherboard?

Thanks for any advice.

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November 4, 2013 3:29:33 PM

Not worth it. If you really feel the need, no point in getting ivy if Haswell is close enough in price. Some are finding them to be $20 or less in price lately. I honestly think you will be OK though.
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November 4, 2013 3:30:54 PM

Nope, PCIe 3.0 is a gimmick at this point...unless you plan to CF a pair of R9-290X cards you won't saturate a PCIe 2.0 bus.
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a b à CPUs
November 4, 2013 3:41:11 PM

I can confirm a single 290x does not get bottlenecked by PCI-E2.0
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