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Will Core2duo bottleneck 2 470 in SLI

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March 11, 2011 8:30:53 AM

Hello forum! Long time reader, first time poster.

My question is this: I currently have 1 470GTX , just upgraded from an original 8800GTX and was impressed with the improvements, so I wanted to go ahead and SLI another one. But would my core2duo 6600 @ 3.4ghz OC bottleneck the video cards?


a b Î Nvidia
March 11, 2011 8:45:41 AM

even with single card you need to OC your card to minimize the bottleneck. so yes 470 in SLI will be hugely bottlenecked by your current CPU
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a b Î Nvidia
March 11, 2011 8:58:16 AM

Yes for some games. Quads are needed more and more. You also have the issue of the 3.2GHz C2D is fine for one GTX470, but can't keep up with two. If you're at 1680x1050, I wouldn't bother getting another because two GTX470s is overkill for such a "low res".
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March 11, 2011 8:59:46 AM

yep, it would bottleneck. you have to upgrade the CPU to a Q9xxx OCed or better to not bottleneck 2x 470s.
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March 11, 2011 9:05:44 AM

Thanks for the replies. I suppose a new mobo/cpu is overdue. Back to the drawing board!
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March 11, 2011 5:11:32 PM

You could get the second 470, because with the 570 out the 470 wont be around much longer. Even if it makes little difference, you have the pair of cards ready for when you upgrade to a new sli mb/cpu.
Not all games use the cpu alot. I have a living room pc with a 939-x2-4400+@2.4ghz/4870 running at 1080p. The cpu is pretty old and only 2.4ghz, but surprisingly in most games the cpu does fine, there are only about 10 games that are cpu heavy, the rest use mostly the gpu.
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a b Î Nvidia
March 11, 2011 8:19:28 PM

well, if your running a really high res monitor, greater than 1920x1080, then i would say go for it because the extra graphics horsepower will be necessary. if not then i wouldnt worry about it. your single gtx470 is already being bottlenecked by your cpu a little bit. You will see improvement from switching to a SB 2500k processor and motherboard. Dont bother with amd phenoms though, in your case you wont be getting much of an upgrade as phenoms are pretty much on par with core 2 cpu's clock for clock.
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March 12, 2011 8:51:04 AM

iam2thecrowe said:
well, if your running a really high res monitor, greater than 1920x1080, then i would say go for it because the extra graphics horsepower will be necessary. if not then i wouldnt worry about it. your single gtx470 is already being bottlenecked by your cpu a little bit. You will see improvement from switching to a SB 2500k processor and motherboard. Dont bother with amd phenoms though, in your case you wont be getting much of an upgrade as phenoms are pretty much on par with core 2 cpu's clock for clock.


Agreed. Core 2 Duo (oc to the max) is beginning to bottleneck the new games (like Crysis 2). Upgrade from Duals to Quads is now advisable more then ever. Future games will be more and more heavy on processor (multiple cores/threads will be must have) Duos CAN barely cope with new games like GTA 4, Crysis 2 and e.c.t.

My XFX 8800 GTS 640MB is performing very well in new Crysis 2. So in Crysis 2 case, Core 2 oc'ed reached it's peak (cpu usage is 100% all the time, and you can see a little bottlenecking occur from time to time) For example save game struggles to load, and game sometimes crash. Also, when it's on max settings some times (rarely) it takes up to 1 second to process bullet impact... Am not sure but i think it's the cpu job. Because it's already on max 100% usage and when game demand a little more processing power, he fails to process that information and 1 second physics stall occurs. Kinda funny :)  And it happens only on hardcore (max) details (too complex physics for cpu i guess).

But on other side, 8800 GTS is working very well considering it is the old card. In max settings (hardcore) for my Samsung 961BF (1280x1024) i have 25 fps average (min 19 fps and max 45fps) and it's playable. In medium settings (advanced) game still looks awesome and i have much better frames per second. Average is 50 fps (min 35 fps and max 65 fps) so it is very smooth, again considering the age of my graphic card and the new hw demanding game... Again in max, medium and low details cpu is running on 100%! Barely struggles to cope with the graphic card.

You can see my full configuration in the signature and btw graphic card is not over clocked! I had faster MSI 8800 GTS 320MB extremely oc'ed (as GTX on standard clocks) and it died in last year of 3 year warranty. So now i don't oc graphic cards :) 


EDIT: added more information
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March 19, 2011 4:57:44 AM

Thanks for the advice guys, I think I will pick up another 470 just for the future. They are selling for pretty cheap now.

@adam : I had pretty much the same video card but from BFG, went through 3 of them in 3 years lol. Friend of mine also had 8800 and had to replace it at least once. Good powerful cards, but there was a bad batch. Glad yours lasted so long, I'd still be using it if I hadnt tried to make FFXIV run better... waste of time that was lol.

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March 19, 2011 6:05:44 AM

I'd recommend Intel's i5 760i at the very minimum if you're going SLI. That'll pretty much take care of your needs. Plus, make sure that your second 470 is the same as the previous one, though it can be of a different make/ brand. But the clock speeds must be the same. Considering the heat that one 470 generates, make sure your rig is well ventilated. Personally, I'd go for the MSI Twin Frozr II version, by far the best in my books!

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

It's currently out of stock, but just to show you which one I'm talking about. Also, make sure you have enough power to support the setup. A good branded PSU is a must! I'd go with this one:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Besties!! :) 
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March 26, 2011 8:48:25 PM

don't SLI 2x 470s. If you want a more powerful video card sell your 470 and buy something better, a 570 or 580. IMO SLI should only be used for the highest video cards out atm.

I have a 5870, I could spend the same amount of money getting another 5870 and a new PSU, or just get a gtx 580. And not have to deal with microstutter.
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a b Î Nvidia
March 26, 2011 11:03:06 PM

SLI can handle different clock speeds Nameless.
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April 1, 2011 7:02:15 PM

Best answer selected by Vemi.
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a b Î Nvidia
April 1, 2011 7:37:02 PM

lmulder said:
don't SLI 2x 470s. If you want a more powerful video card sell your 470 and buy something better, a 570 or 580. IMO SLI should only be used for the highest video cards out atm.

I have a 5870, I could spend the same amount of money getting another 5870 and a new PSU, or just get a gtx 580. And not have to deal with microstutter.

There is no microstutter in SLI. It's a crossfire thing.
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a c 172 Î Nvidia
April 1, 2011 7:43:01 PM

Best answer selected by mousemonkey.
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April 1, 2011 7:49:06 PM

why did you choose the best answer MM? xD
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