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PSU source of low OC potential?

post #1 of 4
Thread Starter 
Alright so I've had 4 different 7970s. None of them could reach much more than 1150Mhz without exhibiting artifacts, and it seemed like for every card, adding any amount of voltage had NO effect on the maximum stable clock speed. Power limit was always +20.

There's bad luck and then there's "something strange is going on here." Getting 4 7970s that can't get past 1150Mhz seems to be some absurdly bad luck, and I just wanna make sure the cause of this isn't my PSU before I continue foolishly chasing down a 7970 that can reach a good OC. My PSU has never shut down from being overloaded and the cards don't crash (only artifacting), but if a PSU isn't quite good enough, could it cause a GPU to produce artifacts at a lower clock speed than a more powerful GPU?

Wattage is fine. I'm using a Corsair TX850W which is more than enough wattage. But honestly I'm still a bit of a noob with power supplies and I don't understand much other than the wattage part of it. Here's the PSU on newegg: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139009

Unfortunately my PC isn't fully together right now so I can't take a GPU-Z screenshot of all the electrical-related readings, but I'll post one up tomorrow.

Some more system info:

CPU: i5 3570K OC'd to 4.4Ghz at STOCK voltage
RAM: 2x4 GB 1333Mhz, OC'd to 1600Mhz @ 1.6v
Devices: 7200rpm HDD, Samsung 840 Pro SSD
Fans: 6 120mm case fans (full-speed), and 120mm Cooler Master Hyper 212 Evo CPU fan
post #2 of 4
Try a known good overclocker from a friend. Ocs are all luck of the draw, other than going with one that is known to have a good oc you can't deduce anything. I went from a fantastic overclocking 670 to a really poor one that would not oc past factory standards, sucks but it happens. Best of luck to you though. If you can get a good OC'er in your rig that fails, then you can start to pinpoint what the problem is
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CPUMotherboardGraphicsGraphics
Intel I7 4930K @ 4.6ghz ASUS Rampage IV Extreme EVGA GTX 970 EVGA GTX 970 
RAMHard DriveHard DriveOptical Drive
G. Skill Ripjaws X 4x4gb 1.5tb WD Caviar Green SATA Samsung 840 EVO 250gb SSD HP USB DVD 
CoolingCoolingOSMonitor
Antec Kuhler 650 ThermalRight True Spirit 140 Power Windows 10 Ultimate 64 bit Samsung 240 HD TOC 
KeyboardPowerCaseMouse
Razor Lycosa PC Power and Cooling Silencer 910 NZXT Switch 810 Matte Black It clicks.............. 
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IKEA $1 pad 
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post #3 of 4
Lower your temps. Your psu is fine
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post #4 of 4
When I hit the limit of the ST1500, I could overclock to X frequency and then anything over that would end in power cut.
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