My cooling is a HR-03GT with a 92mm fan on top with stock HR-03 sinks on memory and VRM. I am looking to install this guy
http://www.thermalright.com/new_a_pa...50aHVzaWFzdA== (an HR-09 Type 4) onto the VRMs. I already tried the HR-09 Type 2 but its wider 15.5mm base is too wide and cannot fit properly onto the VRMs. The Type 4 guy has a 12mm wide base so it should fit. I found that the card is extremely sensitive to upping the voltage on the core and the memory. When you do both you get BS much faster. I think in this case it is some kind of OCP kicking in. You will see that yourself if you try to voltmod the memory in addition to the core. With such a high core at 880MHz or 900MHz you will not be able to OC the memory much from your 1000MHz, or at all. I would say that you will get artifacts as soon as you hit over 1050MHz so if 50MHz is worth it for you to mod things go ahead. Unfortunately the 4870 XOC BE does not OC that well. I am not sure about other cards but I think most 4870 have a problem getting over 850MHz core and about 1125MHz - 1150MHz memory.
I also found the same thing you did in terms of ATITool/FurMark and games. If I stabilize ATITool can be artifact free with high voltage at high core clocks with good cooling. However, FurMark crashes at those voltages so it forces you to go with lower voltages if you want higher clocks for FurMark. These higher clocks at lower voltages however cause instability in games as your lower volts now are not sufficient for stable operation in games so you need to lower your clocks as well. It is a really stupid cycle that I found. Hence the reason why I had to stabilize at the clocks I mentioned before. I have worked on this card for > 12 days straight with constantly the same results using three different cooling systems and several cards. All were with same results.
To summarize, what you will find is that if you up the memory voltage and memory clock you will have to lower your core clock and potentially core voltage, and vice versa. The highest stable overall combination will be something in between 850/1150 and 875/1125 (notice the trade-off between core and memory clocks
). Ironically, I found that in games the best performance was at 825/1125 clocks and that anything higher did not yield anything significant in terms of FPS (some higher clocks even yield less :s
as well as that the performance at higher clocks did not justify the added heat output and power consumption of the board.
Originally Posted by dejanh
My cooling is a HR-03GT with a 92mm fan on top with stock HR-03 sinks on memory and VRM. I am looking to install this guy http://www.thermalright.com/new_a_pa...50aHVzaWFzdA== (an HR-09 Type 4) onto the VRMs. I already tried the HR-09 Type 2 but its wider 15.5mm base is too wide and cannot fit properly onto the VRMs. The Type 4 guy has a 12mm wide base so it should fit. I found that the card is extremely sensitive to upping the voltage on the core and the memory. When you do both you get BS much faster. I think in this case it is some kind of OCP kicking in. You will see that yourself if you try to voltmod the memory in addition to the core. With such a high core at 880MHz or 900MHz you will not be able to OC the memory much from your 1000MHz, or at all. I would say that you will get artifacts as soon as you hit over 1050MHz so if 50MHz is worth it for you to mod things go ahead. Unfortunately the 4870 XOC BE does not OC that well. I am not sure about other cards but I think most 4870 have a problem getting over 850MHz core and about 1125MHz - 1150MHz memory.
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