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HD 7870GHZ overclock limits and what to expect

post #1 of 9
Thread Starter 
Hello finally bought a new GPU, HD 7870Ghz edition HIS IceQ, what kind of overclock should I expect from this chip?
And how big of an increase in performance should I see from a HD5770?
Edited by paulerxx - 7/20/13 at 1:01pm
post #2 of 9
With changed vcore and power limit to 20% you can reach 1.25ghz on core and you would see 2.7x more fps with a hd 7870
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post #3 of 9
Thread Starter 
thumb.gif so I should expect to max everything at 1680x1050?
post #4 of 9
About 580gtx performance at stock and hd 7950 withva OCed hd7870ghz. Check lastest Techpowerup review
Edited by PontiacGTX - 7/20/13 at 1:19pm
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post #5 of 9
I don't mean to hijack your thread, but this seemed a good place to ask instead of starting a new thread. Just how "safe" is putting a 7870 at 1.275-1.300v? I can easily push my 7870 to 1260/1450 but would require around 1.290v which makes me wonder if it's fine to run at that amount of voltage.
post #6 of 9
Mine does 1.15ghz at stock it didnt pass 1.25
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post #7 of 9
Thread Starter 
Is it possible to get 1.3ghz on the core and 1500 on the memory with a slight voltage boost + fan at 85%
post #8 of 9
Quote:
Originally Posted by paulerxx View Post

Is it possible to get 1.3ghz on the core and 1500 on the memory with a slight voltage boost + fan at 85%

OP the limiting factor with OC is the quality of the chip you get and the cooling solution which determines core and VRM temps at high OC. stability at high voltage OC is related to temperature. core temps below 70c and VRM temps 90c is generally safe and should allow best possible OC. normally 1.2 ghz is quite achievable. beyond 1.2 ghz is not so common unless you get a golden chip and your cooler is very good. HIS Iceq is a decent cooler but does not have VRM heatsinks. so monitor both core and VRM temps when overclocking. make sure you have good air flow in the case.

as far as performance improvement wrt HD 5770 is concerned its massive. more than 2x perf at stock and closer to 2.5x with OC. good luck.

http://www.techpowerup.com/reviews/AMD/HD_7850_HD_7870/26.html

1920 x 1200

HD 7750 - 43
HD 5770- 45
HD 7870 - 100

http://www.techpowerup.com/reviews/Powercolor/HD_7870_PCS_Plus_Vortex_II/27.html

1920 x 1200

HD 7750 - 38 (perf close to HD 5770)
HD 7870 - 91
PCS+ HD 7870(1.15 Ghz) - 100 ( 40 x 2.5 = 100)
Edited by raghu78 - 7/20/13 at 11:07pm
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post #9 of 9
Thread Starter 
Quote:
Originally Posted by raghu78 View Post

OP the limiting factor with OC is the quality of the chip you get and the cooling solution which determines core and VRM temps at high OC. stability at high voltage OC is related to temperature. core temps below 70c and VRM temps 90c is generally safe and should allow best possible OC. normally 1.2 ghz is quite achievable. beyond 1.2 ghz is not so common unless you get a golden chip and your cooler is very good. HIS Iceq is a decent cooler but does not have VRM heatsinks. so monitor both core and VRM temps when overclocking. make sure you have good air flow in the case.

as far as performance improvement wrt HD 5770 is concerned its massive. more than 2x perf at stock and closer to 2.5x with OC. good luck.

http://www.techpowerup.com/reviews/AMD/HD_7850_HD_7870/26.html

1920 x 1200

HD 7750 - 43
HD 5770- 45
HD 7870 - 100

http://www.techpowerup.com/reviews/Powercolor/HD_7870_PCS_Plus_Vortex_II/27.html

1920 x 1200

HD 7750 - 38 (perf close to HD 5770)
HD 7870 - 91
PCS+ HD 7870(1.15 Ghz) - 100 ( 40 x 2.5 = 100)
thumb.gif thank you, cannot wait to receive it! tongue.gif
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