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Gigabyte GTX 650 OC 1GB memory overclocking "problems"

Mycielski
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Go to solution Solved by Fasauceome,

Colorful artifacts means instability. Unfortunately you have not won any silicon lottery.

Hi guys!

 

Just wanted to ask you, about my overclocking experience of a GTX 650. It's in an old rig, with a Core2Quad and with 8GB of DDR2.

A few days ago I started to OC the card, with the trusty old method. I fired up Afterburner, and GPU-Z to check real numbers, and Unigine Heaven to test.

I started to increase the core clock (step by step by +10MHz) on stock voltages, then when there were a crash, I started to increase the voltage. I achieved a mild OC, at +37mV (that's the max on this card) I got a stable OC of +155 MHz on core. Then with further testing I decided to dial it back to +140 MHz. I got about a 7% increase in performance according to Heaven scores, so I was quite happy with the result.

Then I started to increase the memory clock also. And this is when I run into "problems".

I started to increase the memory clocks with the +37mV, and +140MHz on core, step by step, by +10MHz increments. Everything was all good, until I reached +80MHz. Then in the middle of the benchmark in Heaven, some red coloured space invaders appeared, and the screen freezed, then I got a black screen (I had to force restart the machine). Now I run it with a known stable (2-3 hours of Heaven) +60MHz on memory.

 

My main question is, that this phenomenon means, that I reached the end of memory clock OC? Just asking it, because I searched about OC result regarding THIS card, and some achieved  more than 200MHz on memory... I know that every card differs, but this +60MHz seems to be a bad joke...

What's your opinion about this? I went with the wrong method, I should only push memory clock, with stock core freq and voltages? Please skilled overclockers, give me some advise!

 

Thanks for your help, in advance!

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Colorful artifacts means instability. Unfortunately you have not won any silicon lottery.

I WILL find your ITX build thread, and I WILL recommend the SIlverstone Sugo SG13B

 

Primary PC:

i7 8086k (won) - EVGA Z370 Classified K - G.Skill Trident Z RGB - WD SN750 - Jedi Order Titan Xp - Hyper 212 Black (with RGB Riing flair) - EVGA G3 650W - dual booting Windows 10 and Linux - Black and green theme, Razer brainwashed me.

Draws 400 watts under max load, for reference.

 

Linux Proliant ML150 G6:

Dual Xeon X5560 - 24GB ECC DDR3 - GTX 750 TI - old Seagate 1.5TB HDD - dark mode Ubuntu (and Win7, cuz why not)

 

How many watts do I need? Seasonic Focus thread, PSU misconceptions, protections explainedgroup reg is bad

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As far as I researched this topic, even with artifacts the card should produce images, but mine is locked as soon as the red "space invaders" appeared. Or I am wrong?

I know :D But I'm still interested in the topic...

It looked a bit like this one, but in red, and my rig's video output is locked up (the machine itself continues to work).

(Pic is from some EVGA forum)

gpu_artifact.jpg

Edited by Mycielski
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