My first step before I even got a good feel for the non-OC'd card was to start overclocking, as it had great potential. I initially tried using Overdrive but quickly found limitations.
I found a nice tool known as RBE (Radeon BIOS Editor) and made a custom BIOS for myself incorporating a fan mod, the upper OC limits of the 4870, and most of all, more power (1.2 volts). This got me up to 690-core and 1123-memory mostly stable. I wanted more though (4870 core speeds). So I looked for a while, and found the points to do a pencil mod for my card.
After bumping the voltage up to 1.3 volts at full speed, I was able to achieve 720-core and 1123-memory. I ended up dropping these down to 715-core and 1118-memory though for better stability.
All the clocks I listed were stable though a full 3dMark Vantage run and in the end my card will generally not run over 80C and my card is very stable at 715-1118.
The 3dMark Vantage scores are as follows:
The Following clocks were at Stock Voltage
- Stock: 625-933 = 5286
The Following Clocks were at 1.2 volts (BIOS Mod)
- 690-1130 = 5933 (unstable for long term)
- 690-1188 = 6111 (Very Unstable)
- 690-1103 = 7192 (Very Stable)
- 690-1123 = 7240 (Somewhat Stable)
- 715-1123 = 7431
- 720-1123 (Stable) = Full Benchmark Not Ran
- 725-1123 = 7469
- 725-1128 = Not Stable
If someone would like me to, I would be glad to send them a pre-overclocked BIOS for their card. I may need the original, depending on the model. Though I will not be responsible for what happens to your card, or anything else.