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Overlock requirements for 560 TI SLI

post #1 of 6
Thread Starter 
Hey there,

I'm building a new gaming system and the CPU/GPU combo I have picked out is the i5-2500k/ASUS GTX 560 Ti DirectCU II x 2 in SLI. My question is this: I've read that in order to take full advantage of the card's power I really should OC the processor...is there an easy way to determine how far you need to push the processor in order to be doing the cards justice?
post #2 of 6
well, you could just do some simple benchmarking at different processor speeds and see at which point another step-up no longer effects frame rates.

but a 4ghz overclock is easy as 1-2-3 and shouldn't even really require any serious stress testing considering the fact that it is just the tip of the iceberg in sandy bridge overclocking.

With 4 ghz you should be fine.

i have my 2600k at 4.2 ghz and it has yet to ever pass 30 percent load in bad company 2 across all 8 threads, so i'm confident that a second 560 ti, which i plan to get, would still not require more.

that being said, in games that will handle 8 threads, you are limited to just 4. so proportionately i would say this:

1 560 Ti and 2600k at 4.2ghz/8threads =max 30%, so half the threads would max at 60% load.

a 4.5ghz overclock should be the maximum you would need to not bottleneck the SLI configuration, and that is being very generous. people overestimate the CPU requirements because they tend to hit a plateu with modern game settings while graphics cards can be pushed much further due to higher resolutions, higher quality textures, extra anti aliasing, etc, that solely depend on the GPU.

you could pull it off with a good air cooler too.


/edit also i have heard that the non-Ti version of the 560 performs very similar to the Ti version, yet is considerably cheaper. just something to keep in mind, however, i also recall that they have the same power draw.
Edited by civilian_pr0ject - 8/14/11 at 8:19pm
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500GB WD RE4 ASUS DRW-24B1ST Windows 7 Pro 64bit ASUS 26" + LG 23" 
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post #3 of 6
Thread Starter 
Yeah, the universal opinion seems to be that stock coolers are garbage if you want to OC so I'm getting a Cooler Master Hyper 212 to replace it. I'm primarily gaming with this system so I definitely want to get the most possible out of my GPU setup. This will be my first solo build/overclock venture so I'm naturally somewhat nervous but EVERYONE I talk to and EVERYTHING I read says the Sandybridge CPU's (the i5-2500k in particular) are VERY OC-friendly so I'm not worried about pushing it to 4.5ghz at all.
post #4 of 6
Getting a 2500k to 4.5Ghz is incredibly easy and unless your chip is a mega-failure (which 99% of chips aren't) you'll be able to do it by changing just a few settings and having a decent cooler. The CM Hyper212+ is plenty if you're just doing 4.5-4.8Ghz. At these speeds, your CPU won't be bottlenecking your GPU's at all.

One thing though, you might want to look into getting 560Ti's that arent the DCII...the DCII are three slot cards, so fitting them in can be difficult/impossible on some boards. If you're even able to get them in, you have temperature issues to worry about with them being so close together. You'd be better off getting the TFII/TFIII cards or reference design.
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post #5 of 6
Thread Starter 
Oh damn, I thought the DCII's http://www.newegg.com/Product/Produc...82E16814121425 were two slot cards No big deal as my board is plenty big enough and I have the Cooler Master HAF-X, however Thanks for the advice/assistance all the same!
post #6 of 6
Quote:
Originally Posted by Quigleyman73 View Post
Oh damn, I thought the DCII's http://www.newegg.com/Product/Produc...82E16814121425 were two slot cards No big deal as my board is plenty big enough and I have the Cooler Master HAF-X, however Thanks for the advice/assistance all the same!
Oops, you're right. The DCII ATI cards are 3 slots, but the DCII Nvidia cards are only two slots. My bad.
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