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GTX 580 SLI bottleneck by QX9650 OC?

post #1 of 18
Thread Starter 
Hello all! I'm brand new here, but have been a long-time lurker. I've gotten SO much information from these forums!

I was recently given a QX9650 that Intel had given my brother a few years back, so I built a system around it.

QX9650 (currently OCed to 4GHz and change)
Foxconn Blackops X48 board
8GB DDR3-1600 (running at 14xx, until I manage to OC FSB to 400. I'm working my way up)
128GB Sandisk Extreme SSD
Zotac Amp GTX 580 1.5GB
Diablotek 775W

My question is what bottlenecks I can expect if I add a 2nd 580 in the mix? Will my 9650 be much of a bottleneck at all? I know that some games are much more CPU heavy than others (Arkham City seems to only utilize 70-80% GPU, but is rather choppy at times), and bottleneck is a subjective term, but I'm just kinda curious if any of the experts here have knowledge of just how much extra performance I can expect from a 2nd 580 in most cases. If it's only going to be a 15-20% improvement in FPS, I'd rather skip it and wait for the 700 series. My computer room is enough of a toaster after a decent gaming session. I just hate choppiness in all its forms, and would like to run games maxed.

Also, I'm pretty sure my PSU can handle the load. Maybe not with my processor OCed, but I've read posts of others with 580 SLI running on 750s.
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post #2 of 18

Well, the thing with Diablotek PSUs is that I've never seen anyone ever say anything even remotely good about them.  All I ever see about Diablotek PSUs from the experts on here is pretty much this:  avoid at all costs.

 

So, I wouldn't add another 580.  I wouldn't even be overclocking;  it's just too risky.  All it takes is about 1-3 years with a low-quality PSU, and then then "fun" starts - which can end up being very expensive.

 

My personal recommendation is, ask what the experts think about your PSU by making a thread about it in the Power Supplies forum on here.  Tell them what you want to do and ask if this particular PSU would be good enough for it.

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post #3 of 18
My old Q9550 bottlenecked my GTX470's pretty bad when I tired it. I tried SLI on a 780i board which sadly would only let me hit 3.6ghz, unlike the 4.2ghz I could get on my ud3p board. Scaling was crap, if you want to run SLI 580's you want a lga1366 i7 atleast. Plus you have to do a driver hack to get sli working on the x48 chipset.

If you want more GPU performance dump the GTX580 and pick up a 7970 they are the fastest card right now while still being light on the wallet. Though a 7950 would be just as good of a choice, they OC pretty well. I wouldnt get anything lower then that as a 7870 is equal to a GTX580.
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post #4 of 18
Thread Starter 
Thanks for the replies.

TwoCables - Yeesh, now I'm more than a little worried. I've never had any stability issues at all (even when I tested OCing the card to 925MHz), but I'll definitely check into it. My particular PSU has gotten good reviews that I saw, but I don't really have anything against upgrading.

DzillaXx - Yeah I've been looking at the 7970s too, especially since they've gotten so much cheaper recently. The reason I keep coming back to Nvidia, though, is because of PhysX. Sure, most games don't even touch it, but when games use it well (Batman: AC in particular), it really adds a lot to the game. Plus the 7970 wouldn't be enough of a performance bump to be worth the price to me (as opposed to adding another 580 for ~$200ish used). Thanks for the input though. Looks like I'll be waiting for the next Intel and Nvidia lines, and doing a brand new build.
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post #5 of 18
Quote:
Originally Posted by DrBrogbo View Post

Thanks for the replies.
TwoCables - Yeesh, now I'm more than a little worried. I've never had any stability issues at all (even when I tested OCing the card to 925MHz), but I'll definitely check into it. My particular PSU has gotten good reviews that I saw, but I don't really have anything against upgrading.

 

Oh.  Were these customer reviews, or professional reviews?  I mean, professional reviews are the only reviews that I think should really ever be trusted.

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post #6 of 18
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

Oh.  Were these customer reviews, or professional reviews?  I mean, professional reviews are the only reviews that I think should really ever be trusted.

User reviews. I haven't found any professional reviews of my PSU (or many other Diablotek for that matter). I did see the JohnnyGuru review of the Diablotek 1050, but that was a totally different PSU series, and 2 years ago. Most of the stuff around the power supply forums is that Diablotek is bottom of the barrel crap, but most of the opinions I saw were based on things they'd heard, not personal experience.

I'm not defending my PSU, as if it's really a piece of junk, I would like to replace it ASAP. It's just that I'm not so sure about blindly trusting people's opinions, who don't necessarily have experience with the PSU in question.

For the matter at hand, though, looks like I'll definitely not be adding a 2nd 580 to this power supply. Thanks for the input!
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post #7 of 18
Quote:
Originally Posted by DzillaXx View Post

My old Q9550 bottlenecked my GTX470's pretty bad when I tired it. I tried SLI on a 780i board which sadly would only let me hit 3.6ghz, unlike the 4.2ghz I could get on my ud3p board. Scaling was crap, if you want to run SLI 580's you want a lga1366 i7 atleast. Plus you have to do a driver hack to get sli working on the x48 chipset.
If you want more GPU performance dump the GTX580 and pick up a 7970 they are the fastest card right now while still being light on the wallet. Though a 7950 would be just as good of a choice, they OC pretty well. I wouldnt get anything lower then that as a 7870 is equal to a GTX580.

Yeah but on your core2quad the 7970 would perform a lot better then two gtx580's. Plus overclocking the 7970 to around 1150-1250 and the jump over a single GTX580 is pretty large. Though the 8970's should be coming out soon something always to consider.
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post #8 of 18
Quote:
Originally Posted by DrBrogbo View Post


User reviews. I haven't found any professional reviews of my PSU (or many other Diablotek for that matter). I did see the JohnnyGuru review of the Diablotek 1050, but that was a totally different PSU series, and 2 years ago. Most of the stuff around the power supply forums is that Diablotek is bottom of the barrel crap, but most of the opinions I saw were based on things they'd heard, not personal experience.
I'm not defending my PSU, as if it's really a piece of junk, I would like to replace it ASAP. It's just that I'm not so sure about blindly trusting people's opinions, who don't necessarily have experience with the PSU in question.
For the matter at hand, though, looks like I'll definitely not be adding a 2nd 580 to this power supply. Thanks for the input!

 

Yeah, that's why if this were my situation, then I'd only feel comfortable once I asked the experts in OCN's Power Supplies forum.

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Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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post #9 of 18
Good sir, when veteran members give you advice, its not necessarily from their own experiences but from other members that make troubleshooting threads.

not beatin on ya, just letting you know where the more objective members come from
    
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post #10 of 18
Thread Starter 
Quote:
Originally Posted by DzillaXx View Post

Yeah but on your core2quad the 7970 would perform a lot better then two gtx580's. Plus overclocking the 7970 to around 1150-1250 and the jump over a single GTX580 is pretty large. Though the 8970's should be coming out soon something always to consider.

How is that possible? I know a 7970 is a decent chunk faster than a single 580, but SLI 580 should be a decent chunk faster than a single 7970, even OC. If SLI 580s are hurt by bottlenecking with my CPU, wouldn't the 7970 face the same fate? Is there something in the C2Q architecture that makes them inherently more friendly to AMD or something?
Quote:
Originally Posted by TwoCables View Post

Yeah, that's why if this were my situation, then I'd only feel comfortable once I asked the experts in OCN's Power Supplies forum.

Thanks for the input. I did create a thread in the power supplies forum, but haven't heard back yet.
Quote:
Originally Posted by TheReciever View Post

Good sir, when veteran members give you advice, its not necessarily from their own experiences but from other members that make troubleshooting threads.
not beatin on ya, just letting you know where the more objective members come from

I meant no disrespect at all. I'm still rather new here, and honestly had no idea who I was speaking to. If I seemed dismissive of his advice, I apologize. I just didn't want to throw the baby out with the bath water.
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Overclock.net › Forums › Graphics Cards › NVIDIA › GTX 580 SLI bottleneck by QX9650 OC?