First of all, let’s take a look at the BIOS options. BIOS settings
can make or break your overclock, so let me share what kind of settings work
well for me.
The slick looking Venus boot-up screen display
This is where you will be spending most of your time adjusting
settings and trying out various options, the Genie BIOS settings menu:
I did the overclocking tests on my AMD FX60 batch # 0536 SPMW.
I left CPU VID at startup value. In order to get 1.7v which
works quite well for my FX60, I set VID Control to 1.475v and CPU VID Special
Control to Above VID * 116.8%. I use chipset voltage of 1.81v
setting and DRAM Voltage of 3.60v. The DRAM Voltage monitor shows 3.57v which
works great with my pair of 512MB GSkill GH Memory based on the Winbond UTT
Now for overclocking the 7900GTX cards, I used a rather high
PCI Express Frequency. These cards overclock better with a raised PCIE Frequency,
and the board can go up to the maximum of 145MHz stably with a x16 slot setting
for single card overclocking. However, when set to dual x8 slot configuration
for SLI tests, the board is stable only up to 122MHz PCIE Frequency. This is
one of the barrier for extreme overclocking the 7900GTX in SLI mode.
Next, also a very important menu to look at would be your DRAM
Depending on the Memory chipsets your DDR Memory is based on,
you will need to find the right timings for them. However, of note is the DRAM
Drive Strength setting and DRAM Data Drive Strength setting. What
worked well for me is setting the DRAM Drive Strength to Level 03 and
DRAM Data Drive Strength to Level 1 (Reduce 50%). Especially
when extreme cooling your CPU to low sub-zero temperatures, this setting may
help in the stability of the whole system.
I set the DRAM Response time setting to normal from
the default setting of Fast for stability during overclocking.
This board helps me acheive slightly better stability and consistency
when extreme cooling my FX60 as compared to the DFI Expert.
As you can see, the BIOS monitor reads -43C for my FX60 temperature
reading, a big deal for those who have tried extreme cooling on the FX60s which
cold bugs quite easily. I could never get the system running to show this temperature
reading on the DFI Expert.
A very useful tool for overclockers in the windows environment
is the A64 Tweaker.
The above settings are the ones I use for my BH5 Memory. Take
special note of the Max Async Latency and Read Preamble settings.
This board can be quite picky with these 2 settings so if your Memory overclocks
are not stable, do try out different values for these 2 settings. Typically,
a higher value on each will help stability.