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PSU Bottleneck?

post #1 of 9
Thread Starter 
Hey guys, first post but I am pretty familiar with overclocking CPU's and GPU's. I just built my current system about a month ago and I'm trying to clock my SLI'd cards and CPU to their max within good temps.

The issue I'm running into has nothing to do with temps though, all my temps are fine but I'm failing stability tests once I try to reach certain clock speeds.

For example, with my graphics cards I cannot seem to peak over 1030 MHz core clock without the benchmark stopping, the screen goes black for a second and the clock speeds / voltage all return to stock. However, on my GPU's the temps never go above 62 C, which is well below max temps.

On my CPU, I can't seem to break the 4GHz mark and still be able to pass a 2-hour stability check. I get system crashes and/or blue screens after about 30min-1hr of testing -- yet, my temps on the CPU do not exceed 57 C.

This is very perplexing to me as in the past I've always hit much higher temps before running into these types of limits and peaks. I plan to upgrade to water cooling eventually, but with my current low temps, I don't see the point.

I'm pretty sure that temperature is not what's causing me to hit a limit. I'm thinking it's possibly the 750w PSU; but I want to get other opinions before I drop cash on an upgrade that wont break past this barrier.

Thanks! =)
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post #2 of 9
Your setup probably uses by my rough estimate ~ 600w maximum - its very possible that you need to adjust some settings for your processor, and that your GPU's can't hit those levels of over clock.

Since in SLI your over clocking both at the same time, it only takes one weak GPU to ruin an over clock - I'm not sure how high 550ti's typically clock, but I can't imagine they go much over 1GHZ for the most part [Seems average is ~ 1GHZ, with some not clocking much over 1ghz]
Edited by appleg33k85 - 8/4/11 at 3:34pm
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post #3 of 9
I think that it's not the PSU, but it's that you're looking for clocks that are probably not attainable with what you have. I mean you're trying to get the 550 Ti's past 1.03GHz and you're trying to get the Phenom II x6 1090T BE past 4GHz. So you probably just found the limits.

I mean, the 750W Earthwatts has way more than enough power for all of this.
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post #4 of 9
Might want to check your voltages... and it's defiantly not your PSU. 750w can easily handle what you've got, I'm even thinking 450w would even be enough.
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post #5 of 9
Thread Starter 
GPU's
1.1 V -- 1026 MHz Core -- 2112 MHz Memory

CPU
1.425 V -- 232 MHz Frequency -- 17x Multiplier

Those are the current stats. If I try to take my GPU's any higher, even with voltage increases, the stability tanks within 10-30min with perfect temps. And I've heard of people with the same processor achieving 4.2GHz, any thoughts?
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post #6 of 9
Quote:
Originally Posted by Biohack View Post
GPU's
1.1 V -- 1026 MHz Core -- 2112 MHz Memory

CPU
1.425 V -- 232 MHz Frequency -- 17x Multiplier

Those are the current stats. If I try to take my GPU's any higher, even with voltage increases, the stability tanks within 10-30min with perfect temps. And I've heard of people with the same processor achieving 4.2GHz, any thoughts?
Every single CPU is different, and every single motherboard is different. The same goes for video cards.

I could build a perfectly identical system to yours in every last detail, but yet get very different overclocking results. It's like how identical twins may look identical, but yet they are still two different persons.
It's a computer!
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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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Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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post #7 of 9
Thread Starter 
Does that mean that my CPU could be faulty? Or, the 4.2's out there just got lucky? And, do you think that lowering my temps via WC would make any sort of a difference? (aside from increased longevity of my hardware)
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post #8 of 9
Quote:
Originally Posted by Biohack View Post
Does that mean that my CPU could be faulty? Or, the 4.2's out there just got lucky? And, do you think that lowering my temps via WC would make any sort of a difference? (aside from increased longevity of my hardware)
It just means that every CPU is different, just like how identical human twins are different even though they look identical to each other.
It's a computer!
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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 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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post #9 of 9
It's not the PSU, your just asking too much of your components. Not every chip will clock the same. Those getting to 4.2Ghz most likely have a loop or high-end air coolers. So yes, going on water may let you get a higher overclock, but it's not a promise. And beyond 1Ghz for any GPU is pretty good in itself.
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