low fps when increasing memory clock

souvikdas7

Honorable
Jan 4, 2014
36
0
10,530
i have a sapphire r9 285 2gb clocked at 918mhz core and 1375mhz memory. i started overclocking my card and i reached 1060mhz clock and 1500mhz memory with +20% power limit and no increase in voltage. All this was done using msi afterburner 4.0.0. To test the stability and temps i used furmark 1.14.1.4. At stock speeds it gave me 84 fps. At overclocked mode it gave me 91 fps with a increase of 2 degrees in temp. So i decided to overclock it more and bumped up the core to 1070 and it started showing artifacts in unigine heaven. I dont wanna increase the voltage so i kept it at 1060mhz clock. I then bumped the memory to 1550mhz and then again ran furmark and it was stable but the fps dropped to 86fps. I dont know what am i doing wrong here cos i am new to overclocking.
so these are the fps-
core memory fps
918 1375 84
1060 1500 91
1060 1550 86

all these fps are using furmark at 1280 * 720 res and no aa.

full system specs-
cpu-Core i3 2100 3.10ghz
motherboard- GIGABYTE GA-H61M-s1
ram-corasair vengeance 1300 mhz 6gb(4+2)
hdd-WD green 3 tb 7200rpm
gpu-Sapphire r9 285 dual x 2gb
psu-corsair cx 600
case- cooler master k380
monitor-LG flatron e2041
 

4K4M4

Reputable
Dec 18, 2014
21
0
4,540
You're stressing your GPU at this current memory setting. Whenever artifacts or slowdowns begin to show, it's often time to bump the voltages. And beware - I wouldn't recommend Furmark for you to test stability and/or efficiency. It's excellent to test peak temps, but that's about it.

Run solid benchmarks such as 3DMark, or even the Unigine Heaven you mentioned. If the FPS drops reflect on those, then you should definitely bump the voltages up. And don't worry - as long as you do it slowly (the same thing goes for core/memory bumps) and watch your temps, you shouldn't fear touching the voltage. Take your time and you'll be able to increase your performance even further.
 

souvikdas7

Honorable
Jan 4, 2014
36
0
10,530


Thanks for the info man... Can u tell me a guide or show me a video to slowly increase the voltages and achieve better performance? The required power of the gpu was 500 watts and i got 600 watts. so i got a 100 watt headroom to overclock. so i need to how much voltage i can increase within the given headroom.