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3 x GTX 580 bottleneck?

post #1 of 12
Thread Starter 
So I have read several threads with people asking if their 1100T will bottleneck a single GTX 580, they get mixed answers and some people saying you could run SLI and not get a bottle neck.

So here is my question, I have an 1100T OC to 3.7GHz and currently 2 x GTX 580 in SLI. So far to gauge bottleneck I have run unigine 3.0 with with SLI disabled and enabled, with everything maxed I get double performance with it enabled from like 32fps average to 66fps average. A friend offered to sell me his AX1200 and a third GTX 580 for $400, this offer is too good to pass up but will I get a serious bottle neck?

Currently I game at 1920 x 1080 but I also want to get 2 more monitors for 2D surround, with the higher resolution would this offset the bottleneck to an almost unnoticeable occurrence?

Almost forgot I have a Crosshair V Formula MOBO. Also running 4 x 4gb of g.skill 1333 cas 7-7-7-21 would removing 2 dimms possibly.

Main reason for not wanting to get an i7 is I would want the Rampage IV Extreme and that's as much as I spent on my mobo and Phenom II in January.

Bottom Line should I pull the Trigger or wait to get an i7?

p.s.
yes I'm kind of a noob and know this is kind of a retarded question but I just can't find anything to really help me on this one, and insight is greatly appreciated
Edited by tehj15 - 4/15/12 at 5:57pm
post #2 of 12
Yes, a higher resolution will reduce the bottleneck. The load is more on the gpu rather than the cpu at that level.
    
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post #3 of 12
Thread Starter 
ok so the 3 monitors would help, ok thanks
post #4 of 12
A higher resolution can definitely help make use of the third GPU, thus, a Surround setup is a great way to utilize the power of Tri-SLI GTX 580's. thumb.gif However, there is still the issue of having the CPU being fast enough to feed all three cards enough data to crunch. And this is where your CPU may fall short.

Many have found that moving over even to an LGA1155 Sandy Bridge platform, has helped tremendously with overcoming that CPU bottleneck, to properly fuel a Tri-SLI setup.

Although, I won't disagree that an LGA2011 is nicer by having more bandwidth available, Sandy Bridge isn't too shabby either, especially with typical higher overclocking potential, which goes a long for Tri/Quad-SLI setups. They may be worth taking checking out just to have more options that fit in line with your budget. thumb.gif

Bottom line, $400 for an AX1200 and a GTX 580 is a fantastic deal! eek.gif I would jump all over that just to have it for such a phenomenal price, and worry about maximizing it later! biggrin.gif
     
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post #5 of 12
At 1080p the BN from trying to do tri-SLI 580's on a 1100t will definitely 'exist' in a number of gaming scenarios, assuming you bother trying to measure it.

Now, that probably would not happen on the Heaven bench at very high settings, but that test is designed to max out your GPU's w/o requiring much CPU power. A lot of games, however, you'd end up with lower fps than someone else with the same GPU's but a really fast processor, that much is certain, esp. with older games, or heavily CPU-dependent games like GTAIV. However, by 'lower' in many cases that'll mean you get like 150fps, but someone with an IB at 5GHz gets 250fps.

IOW, most of the time, your 'bottleneck' won't 'matter' all that much. Unless you're the sort to sit and stew about the fact you aren't getting the highest framerate your cards are capable of ... even when that additional FPS would have zero practical value. Cause if you will, you may want to consider spending that $400 on an Intel board and CPU ... cause if you actually looked for it, you'd find you have a measurable CPU BN even with the SLI 580's you have now, at least on certain tests/games.

However, you can help remedy the 'situation' (i.e. the frequency and severity) of the CPU BN by increasing resolution/AA levels, and certain gfx settings. These changes slow down the FPS by making your GPU have to work harder, without a commensurate increase in CPU load per frame rendered. When the FPS is lower, it becomes less likely that your CPU will be the limiting factor to performance on any given frame, because it's being asked to do less work in a given time-slice.
Edited by brettjv - 4/17/12 at 9:12am
    
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post #6 of 12
Thread Starter 
Thanks guys for all the insight! My friend sold me the 580 but decided to hang on to the ax1200. Then to make a long story short, hooked up using two old additional PSU because the main was only 1050 and while running unigine I heard loud pop noise eek.gif, everything is ok but PSU is toast. Last night I figured that I could get away running 3 cards with the 3 PSU set up until next week/payday and ordered 2 more matching monitors. I would just order a new PSU but broke frown.gif so found some guy on CL selling a 1000w for 50, to hopefully get me through the weekend on 2. On payday I'm ordering a PSU thinking of getting and antec1200 its cheap, looks cool, and has 6 x 38amp Rails the only negative is that its not completely modular you guys think this is a good power supply I would be ordering from newegg, if there are any better ones wanna keep it under 300 or close including next day.
post #7 of 12
tri 580 3gb is the sweet spot for Surround gaming. I do miss that setup frown.gif Glad to hear your main components survived. Never really run at full throttle on a cheap psu. And don't cheap out on one. Better to pay a bit more than to loose quite a few Benjamins in components.
post #8 of 12
Quote:
Originally Posted by wermad View Post

tri 580 3gb is the sweet spot for Surround gaming. I do miss that setup frown.gif Glad to hear your main components survived. Never really run at full throttle on a cheap psu. And don't cheap out on one. Better to pay a bit more than to loose quite a few Benjamins in components.

^ This times infinity! biggrin.gifthumb.gif
     
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post #9 of 12
Thread Starter 
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?
post #10 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?

I ran an Enermax Galaxy 1250w unit for the triple sli 580 3gb setup and a Cooler Maste Silent Pro Gold 1200w for the tri sli 480s. Any 1200-1250w should be fine just make sure you get quality unit. Use the psu recommendation thread and search for reviews. The AX1200 is one of the best out there and its fully modular. I have tried the TPQ-1200w and I just couldn't stand the amount of fixed cables on it. Its a fully capable psu but this model has too many additional harness permanently fixed on the psu that really becomes annoying. The Enermax and the Cooler Master had most of the utilized cables fixed while the rest were modular. The Cooler Master has ribbon style cables for the modular cables. The AX1200 has all ribbon style cables which look very nice and have no real need to sleeve imho. If you want sleeved cables (and in different colors), Corsair sells pre sleeved cables for the AX1200. Also, look into the Antec HCP-1200. This one took the performance crown from the AX1200 but it has some fixed cables.
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