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3 x GTX 580 bottleneck? - Page 2

post #11 of 12
Quote:
Originally Posted by tehj15 View Post

yeah I guess it only makes sense if you have top of the line/top dollar components you shouldn't be using a $60 generic PSU from ebay. Also My gtx 580's are 1.5gb not 3gb. Also the proper name for the PSU I'm thinking is antec TPQ-1200 (True Power Quatro) but newegg is having a deal on AX1200 for 240 and 20 rebate making these 2 about the same price. Idk which one would be better and not finding a lot of helpful stuff on the net. Also trying to stay on topic what are some benchmarks/games to get an idea of bottleneck for when I do get a PSU?

The AX1200 is the superior unit of those two, although the TPQ-1200 is still a fine unit, for the same price or thereabouts, I'd go for the AX for sure.

I'm not sure what you're asking for exactly afa benches go, but have a look at this article, it'll kinda clue you in to the phenomenon in general. Notice how the much more profound the CPU impact is at 1680x1050 vs 2560x1200 in the graphs there?

Warhead is a fairly CPU intense game, if you flip around to some others you'll see the CPU power has a varying levels of impact vs. what you see in Warhead ... basically though they chose fairly CPU-heavy games except Stalker ... that one looks more CPU dependent than it really is ... you have to account for the fact that FPS it's running at is really quite high, much higher than you need for playability. This is a game where you could turn max it w/4xAA at 1080p and your Phenom would probably compete pretty close with anyone's CPU.

Bottom-line, each gaming scenario is going to be a bit different as you have the CPU dependency to consider, as well as how fast the GPU is capable of running the game at the chosen settings.

Keep in mind there's no magic involved with increasing the resolution ... the reason the CPU has less impact at higher res is because you've lowered the FPS by giving the GPU more work to do. You've just 'shifted' the part that is the limiting factor to performance.

In your situation, running 3 gpu's at 1080 with a Phenom II ... you're gonna need to carefully crank the settings (i.e. maximizing GPU load, w/o increasing CPU load) if you really care to 'alleviate the CPU bottleneck in a lot of gaming scenarios. Stuff like Heaven and 3dMark11, those won't BN much cause they're designed not to and there's no 'game' calculations going on underneath the graphics piece, occupying CPU clock cycles ... but games with relatively high CPU demands you simply won't get as high of FPS as those three cards are capable of getting.

Like I said above, though, in many cases it'll be like the difference between two very high FPS numbers, and it won't really 'matter' in the grand scheme of 'max playable settings' or impact your gaming experience. But that won't always be the case ... some games really like a strong CPU, so ... there will be times you'll wish you had the CPU grunt to match your GPU power, that much I'm pretty certain of.
Edited by brettjv - 4/18/12 at 11:02pm
    
CPUMotherboardGraphicsRAM
xeon X5675 6-core @ 4.1ghz (1.29v, 20x205 +ht ) rampage iii extreme msi rx470 gaming X (the $159 budget king) 3 x 2gb corsair xms3 pc12800 (9-9-9-24-1T@1600MHz) 
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CPUMotherboardGraphicsRAM
xeon X5675 6-core @ 4.1ghz (1.29v, 20x205 +ht ) rampage iii extreme msi rx470 gaming X (the $159 budget king) 3 x 2gb corsair xms3 pc12800 (9-9-9-24-1T@1600MHz) 
Hard DriveOptical DriveCoolingOS
hynix 250gb ssd (boot), 2tb deskstar (apps),1tb... plextor px-712sa - still the best optical drive... corsair h8o v2 aio W10 home 
MonitorPowerCaseAudio
asus vw266h 25.5" (1920x1200) abs sl (enermax revolution) * single 70A rail 850w silverstone rv-03 XFi Titanium 
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post #12 of 12
SB and a P67/Z68 mother board (that supports 3-way sli) is a very good platform. Now that Z77 and IB are coming up, this platform should be available for a great price.

Recommend: cpu i7 2500k/2550k/2600k/2700k

Mother board: Asus WS p8p67 ws revolution, EVGA P67/Z68 FTW, Asus MIVE P67/Z68, Gigabyte UD7 P67/Z68. These guys support three way sli and can be found for a great price preowned.

If you want to stick with Amd, go for BD. I really don't think your PII can do a good job with three 580s.
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