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my bloody dilemma !

post #1 of 17
Thread Starter 
hello all,please help me guys.

my system:



i had sold my GTX 780 and decided to buy Asus GTX 970 STRIX x 2 for 2 way SLI.
but recently i found out that using SLI have many limits such as buying a better power and also a better cpu cooler ( water cooler ) due to an issue known as BottleNeck !
my friend told me if you want to get 100% performance from 2 cards you have to OC your cpu up to 4.5GHz and cool it by a better cooler.
as i am not into OC and as i know, overclocking a hardware for long time use will definitely decrease it's life time ! i can't convince my self that using at 3.5 GHz vs 4.5GHz will have same results in CPU life time and it's stress ! would they be same ? i don't think so really
by this, i think SLI will be hard and annoying for me !

now, i made another decision and want to ask you to help me between these:

1: buy 970 x 2 ,,, a new power ,,, water cooler ( my cooler is Deep Cool ice matrix 400 ) at a really higher price in compare to #2
2: buy a gtx 980 and nothing more. with almost half price of #1

as i calculate, 980 gives average 15 fps more than 970.
and 970 x 2 give average 35 fps more than 980.
both have calculated in 17 games at 1920 * 1080.

i really have been confused ! please help me... thanks again.
post #2 of 17
Well, your friend gave you some good advice, and some bad advice.

Firstly, yes, you shouldn't be running SLI when you only have your 4770 at 3.5GHz; that's a waste. I don't know what you'd buy a 4770K and not overclock the bejeezuz out of it. BUT, you don't need 4.5. I keep my 2500K at 4.3 because there's no need for anything higher usually.
Quote:
i know, overclocking a hardware for long time use will definitely decrease it's life time !

It will not, so long as it's temperatures remain acceptable.

If you're only playing at 1080, you don't need more than one 980. It should do fine.
post #3 of 17
I personally run SLi 780s, and have noticed that it takes a bit of tweaking to get them to not stutter. I always advocate for Single GPU setups. The 980 is a killer card, at a killer price. I went with 2 780s, because of the price, honest.

For SLi setups, you will need to keep in mind that the Top Card always runs hotter. You will need to adjust cooling.

So, I reccomend #2.

And whoever told you that you need to OC your CPU is a dummy. It might help you gain a few more frames, but it does not make a big difference.
post #4 of 17
Thread Starter 
hooaaaaah !
thanks a million guys ! that friend took back his word biggrin.gif
he said now that u can run without OC in price of loosing 5-8 fps biggrin.gif
post #5 of 17
If that`s a 60hz then get a 970 .people says that the panel refresh rate does.t show kore than that even without vsync.
post #6 of 17
Whether SLI is limited by the CPU is really dependent on the game. What SLI regularly does is show just how close a game was to being mostly CPU limited, so you run into CPU limitations all the time. But then in other games you can have 4 cards and see it scale incredibly well. But I think the general advice that when owning high end SLI you should overclock is sound advice, for a sizeable minority of games you would see poor scaling and for a lot of them you would see better frame rates with overclocking than not. Its very rare that overclocking the CPU does not improve the frame rates of games at least a little bit.

But the estimate of 5-8 fps isn't really fair. It could be anything from -50% (a few games not only don't gain from SLI but actively loose performance and you need to set them to single card, F1 2014 being an example of that), anywhere up to about +CPU% because the game is entirely CPU dominated and every single percentage point of performance you add goes straight to to extra frames (Arma 3 is an example of a game that acts like that with even moderate SLI setups).

Its a bit more complicated than your friend is telling you unfortunately. I would recommend the overclock, it is beneficial for SLI users in most games, sometimes its not worth a whole lot of extra performance but sometimes it can be worth +20%.
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post #7 of 17
Thread Starter 
firstly i should appreciate you guys for answering all my questions patiently.
secondly, i decided to change my PSU from Green 750w OC to Enermax Platimax 1000W Platinium.
and changing cooler from Deep Cool Ice Matrix 400 to a mid range water cooler, Enermax Liqtech 120X-HP for a better and cooler CPU system.it can be helpful i think.

the last thing is VGA,
i like to have a pair of 970 instead of one 980. as i calculated according to TechPowerUp 980 & 970 SLI reviews, a pair of 970 will have average 35 fps more than a 980 in 17 games !
i want to know, in worst case, if BottleNeck happend, how many percents of performance will i lose proximately ? how many fps will i lose proximately ?
for example from 35 fps , how many will lost ?
Thanks Again
post #8 of 17
Quote:
Originally Posted by knightiran View Post

firstly i should appreciate you guys for answering all my questions patiently.
secondly, i decided to change my PSU from Green 750w OC to Enermax Platimax 1000W Platinium.
and changing cooler from Deep Cool Ice Matrix 400 to a mid range water cooler, Enermax Liqtech 120X-HP for a better and cooler CPU system.it can be helpful i think.

the last thing is VGA,
i like to have a pair of 970 instead of one 980. as i calculated according to TechPowerUp 980 & 970 SLI reviews, a pair of 970 will have average 35 fps more than a 980 in 17 games !
i want to know, in worst case, if BottleNeck happend, how many percents of performance will i lose proximately ? how many fps will i lose proximately ?
for example from 35 fps , how many will lost ?
Thanks Again
why do you want cards that onyl will show 60fps? are you going to upgrade your monitor to something with more res/ higher refrehs rate?


and there are better and cheaper air cooling options that the CLC you said..
post #9 of 17
Quote:
Originally Posted by knightiran View Post

i like to have a pair of 970 instead of one 980. as i calculated according to TechPowerUp 980 & 970 SLI reviews, a pair of 970 will have average 35 fps more than a 980 in 17 games !
i want to know, in worst case, if BottleNeck happend, how many percents of performance will i lose proximately ? how many fps will i lose proximately ?
for example from 35 fps , how many will lost ?
Thanks Again

In the worst case SLI doesn't work and you will be using a single 970. Before that point you may be trying the game and getting less than that due to negative scaling but if its a problem one of the first things you'll try is looking at GPU usage with say GPU-Z and then switch to a single card. A 970 is about 15% slower than a 980 maybe a little bit more. That is the worst case with SLI and it will happen every now and then.
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Custom watercooling 2xMCR320 1xMCR480 Windows 10 Asus Rog Swift PG279Q Benq XL2411T 
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Corsair K70 Red cherry Corsair HX1050 Little Devil 7 Zowie Evo CL EC2 
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post #10 of 17
don't count fps in sli, they get high average frames but it's the fps drops that matter. if you have enough cash to buy two 970 I'd wait for 980Ti or 390X. You shouldn't have sold the 780 SLI TBH but that was your choice.
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