Gigabyte R9 270x Overclocking

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Rasputin2011

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Feb 6, 2014
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Hello,
I have built my PC using the Gigabyte r9 270x OC edition. The card comes clocked out of the box at 1100mhz of gpu clock and 5600mhz of the memory clock. I have recently overclocked the gpu to 1135mhz and,after bench marking, I saw a 20-30 fps difference in CS:GO and a 10-15 fps difference in BF4. I then OC'D the gpu to 1155mhz and instead of seeing an increase in fps i saw no change from the stock 1100mhz and a decrease from the 1135mhz. Keep in mind that I did not boost the memory clock at all. I'm not very savvy at overclocking so I came here to ask what is the best OC I can receive on this card to achieve the maximum fps in any game while not hurting the card.

My PC Specs
1) Amd Fx 6300
2) 8gb of ballistix RAM
3) R9 270x Gigabyte OC version
4) Gigabyte 78LMT-S2 Mobo
5) Thermaltake tr-2 600 watt psu


P.s. I'm using Gigabyte's OC Guru
Thank you for your help. :)
 
Solution
photonboy
Bottlenecks etc:

Overclocking any component can only increase performance at MOST by the percentage of the overclock. For example, if your Graphics Card was the sole bottleneck in the system (not limited by CPU or other) the overclocking the GPU by 10% could boost from 50FPS to 55FPS. In theory at least.

Thermal throttling:
This is another issue with modern graphics cards. As the GPU gets hotter, the frequency may drop at some point to prevent overheating.

Overclocking:
Many of the cards that are already overclocked don't have much overclocking potential left. It varies, but it might be 3% to 10% for example. Remember what I said about a 10% overclock at BEST can improve frame rates by 10%.

VRAM overclock:
If the GPU is overclocked...
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Rasputin2011

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Feb 6, 2014
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10,510


I'm not sure what you mean by hitting the ceiling? Would you mind explaining?
 
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photonboy

photonboy

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Jun 20, 2006
21,567
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Bottlenecks etc:

Overclocking any component can only increase performance at MOST by the percentage of the overclock. For example, if your Graphics Card was the sole bottleneck in the system (not limited by CPU or other) the overclocking the GPU by 10% could boost from 50FPS to 55FPS. In theory at least.

Thermal throttling:
This is another issue with modern graphics cards. As the GPU gets hotter, the frequency may drop at some point to prevent overheating.

Overclocking:
Many of the cards that are already overclocked don't have much overclocking potential left. It varies, but it might be 3% to 10% for example. Remember what I said about a 10% overclock at BEST can improve frame rates by 10%.

VRAM overclock:
If the GPU is overclocked and the VRAM isn't, this can also prevent an improvement (or reduce it due to thermal throttling). So the BOTTLENECK in this case could be that the GPU can't access the data any quicker. It's like being able to chew faster but not increasing the speed that you send food to your mouth.

Summary:
- overclocking MAY not benefit if bottleneck elsewhere (CPU, or VRAM)
- Thermal throttling can DECREASE performance
- You can only get, at BEST, an improvement proportional to the overclock.
 
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Solution
skit75

skit75

Splendid
Oct 7, 2008
2,684
1
21,460
Every card would be "turned up to 11" if it could. This GPU is manufacturer OC'd already.

At some point in an overclock, you will likely encounter diminishing returns due to a number of variables(physical limitations/thermal run-away/too much jitter in the clock etc...) Sure the GPU can run at that clock speed but as soon as you ask it to do anything other than idle, you get a blue-screen or the card begins to throttle itself. There is a frequency where diminishing returns will set in on that card unless you mod it's cooling capabilities. Yours is in between 1135MHz and 1155MHz
 
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Rasputin2011

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Feb 6, 2014
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After you brought my attention to the clock speeds of the memory I think the memory speeds are holding back the gpu.
 
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Rasputin2011

Honorable
Feb 6, 2014
14
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10,510


I see. Thank you for explaining.
 
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llobell86

Reputable
Nov 28, 2014
19
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4,520
Still having issues.

Im just in front of MSI After Burner. Let me tell u the current and default values:

Core Limit: min (clear box)
Power Limit (%) : +0, and can get +20 value
Core Clock (Mhz) : 1100 (default) can get 1400 (means +400)
Memory Clock (Mhz) : 1400 (default) can get 1625 Mhz (+225)
Fan Speed ...

I have modified and tested the gpu in the very first weeks after the purchase of my PC. Nothing went wrong. All good, and turned again into default settings, saving some profiles.

Suddenly, after reinstalling all (OS, drivers, upgrading to Windows 10 recently and all) no more OC to the GPU

The crashes are to complete BLOCK the system. No way to get Windows, or change windows to another one after getting inside any videogame.
It feels unstable, but it really freeze the entire system after getting into a videogame, like Starcraft II, or any with more and less graphics requierements.
 
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B

buster-dog

Reputable
Sep 18, 2015
2
0
4,510


hi there i managed to get these overclocks, not sure if they are 100% stable but i got 1222mhz on the core clock, so i would suggest 1200mhz,......... and i put the power limit up to 20%........ and i increased the memory from 1400mhz to 1490mhz which is bordering on stable so to be safe go with 1480mhz i used msi afterburner and valleybench to benchmark it and i saw a jump of about 100 points between stock oc and custom oc im also using the gigabyte r9 270x
 
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