700mhz wall on HD4850 is smashed.

[DemonEyez]

@Caped Crusader
@eddieobscurant
@Battlestar
Concering those bios requests: I'll post rapid share links this afternoon. Right now I'm at work.
Important!, I use watercooling. I wouldn't recommend going above 700MHz with the stock cooler

Did some further testing last night, but it seems that 710MHz on the core is the max with stock voltage for me.
715MHz gives me artefacts in AtiTool after 1 minute or so.
But I encountered something else.
It seems that the speedsteps for the overclocking the memory becomes rather large after a certain threshold.

When I set 1125MHz in bios, GPU-Z reports 1125MHz being used correctly
When I set 1135MHz in bios, GPU-Z reports 1125MHz being used
When I set 1140MHz in bios, GPU-Z reports 1125MHz being used
When I set 1145MHz in bios, GPU-Z reports 1125MHz being used
I recall I don't have that problem with Overdrive. When I set 1140MHz in Overdrive, GPU reports 1140MHz.

What's that about? Does driver level overclocking allow for smaller steps concerning mem speeds?


*edit* found something about the changing steps in a MSI HD4850 review on Techpowerup.com:

When changing memory clocks I noticed that the step size (with the software I used) is 25 MHz, so you can only OC to 1000 MHz, 1025 MHz and 1050 MHz - quite a limitation. After 1050 MHz the steps become smaller again.

http://www.techpowerup.com/reviews/MSI/HD_4850/24.html

Perhaps this pattern repeats itself at around 1100MHz