GTX 670 SLI running at PCIe x8 worth it?

SammyNib

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Aug 22, 2013
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I've currently got this PC build:

CPU: AMD 8350
Motherboard: M5A99X Evo R2.0
GPU: MSI GTX 670 PE
PSU: Corsair 750W 80 PLUS Bronze
Case: BitFenix Shinobi
Memory: Corsair 1x8GB
Heatsink: 212 Evo
Monitor: Hannspree 21.5" 1920x1080

I was wondering whether my PSU would support an additional GTX 670 and also I have read that my motherboard will not run in SLI with 2 x PCIe x16 slots it will only run with 2 x PCIe x8 will this slow the cards down noticeably or will it not make a difference. Also do you think an additional 670 is the way to go?

Thanks in advance.
 
Solution


Hi - Yes your PSU will support 2 670's in SLI. Since current GPU's don't realize the full capabilities of
the 3.0 x16 bus, then running at x8 will not be a noticeable...
Definitely , PCIe 2.0x8 is on for it. PSU will power up. Also I think get a Intel i5-4670K + Z87 mobo before the second GTX 670. Its the better way. Later on with that CPU and mobo , you might prefer to save up and make a second PC for something big like streaming , etc. PSU will power up , but tell the exact model , as some older 750Ws have 2x6Pins. Also tell the GPU model.
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SammyNib

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Aug 22, 2013
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GPU Model: N670-PE-2GD5 - 2GB MSI GTX670 PE Power Edition, 915MHz Core, Boost 980MHz, GDDR5 6008MHz Memory
PSU Model: Corsair Builder Series CXM 750W Modular 80 PLUS Bronze Certified ATX/EPS PSU

Although you said about getting a different CPU and motherboard, is it a necessity? Will the 8350 bottleneck SLI GTX 670's?
So far the 8350 has given me very good performance, pretty much on par with my friends 3570k.

Thanks for your help.
 


Hi - Yes your PSU will support 2 670's in SLI. Since current GPU's don't realize the full capabilities of
the 3.0 x16 bus, then running at x8 will not be a noticeable difference.

So, I wouldn't go to the expense of changing mobo's & CPU's.

As far as adding another 670, if you already own one and want increased performance, then adding
another 670 is your best bet, as long as your system is prepared for the xtra heat, and you don't mind a
little more noise.

 
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