ABIT SD7-533 Gallery (2)
Overclocker 8 Feb 2002

ABIT boards are famous for it's SoftMenuIII. On the SD7-533, we are able to change settings through the BIOS. The most important page would be this page where you set the CPU operating speed. In fact, if you are using a P4, the multiplier is locked and it's automatically determined.

The only parameters that can be used to optimised the system on this page is the Clock divider ratio.  This is also the location where you select whether you want to run your memory in async to CPU or at 133 or 166. e.g. 100/100, 100/133 (200/266) or 100/166 (200/333). at 100/166, the system runs faster.

There are 3 selections available if you selected the CPU operating speed, otherwise there are more than 3. e.g. 3/3/2/1, 3/4/2/1 and 48/80/30/15. So what is 48/80/30/15. When you select that (48/80/30/15), the DDR Dram Frequency because 166x2 which means the RAM will run async at DDR333 (166x2). Now why the odd numbers 48/80/30/15. Some basic mathematics is involved.

In fact, the first parameter is a divider. The remaining 3 numbers represent SDR, AGP and PCI. SDR is in fact running at 

SDR : 100/48 x 80 = 166Mhz

AGP : 100/48 x 30 = 62.5Mhz

PCI : 100/48 x 15 = 31.25Mhz

It would definitely be easier to jus put the SDR/AGP/PCI in their respective frequencies than to put such strange numbers for us to calculate.

CPU Vcore voltage is adjustable up to 2.20v at 0.05v intervals. More of a overclocking feature.

To obtain best performance, Prefetch Caching should be enabled. You can enable AGP FastWrite and Sideband Addressing if your graphics card supports it.

We set System Performance to Ultra and CAS Latency Setting to 2T for maximum performance at 100/133. At 100/166, we were only able to run steadily at Turbo mode.

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