First time overclocker needing advice.

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6 Mar 2013
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286
Hi guys, yester I build my first rig...

YOUR BASKET
1 x Gigabyte ATi Radeon HD 7950 Windforce 3X 3072MB GDDR5 PCI-Express Graphics Card with Crysis 3 & Bioshock PC Games £239.99
1 x Intel Core i5-3570K 3.40GHz (Ivybridge) Socket LGA1155 Processor (77W) - OEM £187.99
1 x Gigabyte Z77-D3H Intel Z77 (Socket 1155) DDR3 Motherboard £89.99
1 x BeQuiet Pure Power L8 530W '80 Plus Bronze' Modular Power Supply - With 120mm Silent Wing Fan Built in £66.95
1 x Avexir Core Blue Series 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Memory Kit (AVD3U16000904G-2CW) - Blue Light £59.99
1 x Zalman Z9 USB 3.0 Midi Tower Case - Black £54.98
1 x Thermalright Macho 120 CPU Cooler (Socket 775 / 1155 / 1156 / 1366 / 2011 / AM2 / AM2+ / AM3 / FM1 / FM2) £29.99
Total : £743.98 (includes shipping : £11.75).



and today i'm gonna overclock for the first time.

I've managed to overclock my cpu, that was pretty simple. Although I've only upped it from 3.4GHz to a steady 4.2GHz without adjusting the voltages and coretemp says it reaches about 53C max on a full load.
But i've been trying to OC my GPU and i'm a bit stumped, I don't to damage it.

At stock level my GPU clock is 1000MHz and memory clock is 1250 (is this the situation where people use 1000/1250 for the values?).
I managed to up it to 1100/1350 and it did a full banchmark test on Heaven without changing the voltage and it seemed to run ok.

I then tried to push it a step further by increasing the values to 1200/1450 and tried to run another heaven benchmark.
A couple of seconds in, the screen went fully grey verticle lines. I could still hear the music from heaven in the background and I had to hold the power button to turn off my pc.

Is that a bad thing? Or is that just my GPU not being able to handle the overclock without my increasing the voltage?
 
You tried upping too much on the graphics.

You need to start with much smaller steps than cpu clocking

Best bet would be trying 50Mhz increments while running something like furmark on a slightly reduced resolution, keep upping the clock, until you start seeing artifacts, then back the clock off a little. up the voltage if needed, up the clock a little more, until you find the cards limits :)
 
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