(adsbygoogle = window.adsbygoogle || []).push({}); Hey people. I've been trying to overclock my HD7670M for the past 3 days. I saw people getting stable 875ghz on core & 1000+ memory, i don't even know how that's possible... every time i put my core speed at 770+, it will freeze my laptop. Also, when i OC my card to 770core & 960memory, i will be stable while running benchmarks and surfing the web. But as soon as i start gaming for a few minures, it will just make my screen go colourful and full of vertical lines. PLEASE HELP ME.

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Alright, so temps seem to be okay. In that case overclock the core clock in 25 MHz increments, playing for a few hours on a game each time. This will test for stability. Once you crash, dial back one increment and play some more. If at that point you don't crash then you're good (at that point you can also start increasing/decreasing in smaller increments as desired to get as close as possible to whatever your maximum stable overclock is). Then do the same thing for the memory clock. And then you're done.

It seems you may simply have tried clocking your GPU a bit too high and you were hit with instability.

Oh, cool. I think i may return my laptop and get a good gaming PC... It has to have a hd7790 or a 7870 GPU. Do you have any idea of which components to use in order not to go past 470pounds limit?

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CPU: You must login or register to view this content. (£82.79 @ Aria PC)
Motherboard: You must login or register to view this content. (£52.76 @ Scan.co.uk)
Memory: You must login or register to view this content. (£44.29 @ Amazon UK)
Storage: You must login or register to view this content. (£45.59 @ Aria PC)
Video Card: You must login or register to view this content. (£166.40 @ Amazon UK)
Case: You must login or register to view this content. (£37.32 @ Scan.co.uk)
Power Supply: You must login or register to view this content. (£34.99 @ Maplin Electronics)
Optical Drive: You must login or register to view this content. (£13.15 @ Amazon UK)
Total: £477.29
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-07-03 10:31 BST+0100)

No no no you need at least 550w for a 7870

No you don't. It has lower power demands than a 7950 or a 7970 and yet I've got those two cards running just fine on 750W... with multiple drives... and multiple USB power-sucking devices.

I'm planning to get a power monitor to put onto the wall in a few weeks. My prediction is it's at about 650-700W under load.

You need bigger than a 450w for 7870 as soon as its underload it will crash and they use about 200w each so u can but the CPU uses some and that will also go up understress

7870 won't use more than 200W at stock clocks/volts under load. An AMD FX CPU won't eclipse about 150W at the absolute most under load (and OP's one probably has lower power requirements). Other peipherals etc at 50W absolute max altogether. 400W. And that's overestimating everything.

Why does than manufacturer recommend at least 500w on the and site?