HCLK +33M ???

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Hi! I have a Soltek 65FV+ M/B with a VIA Appolo Pro 693A chipset. I use the HCLK +33M function in BIOS to speed up the RAM. I run my FSB with 83 MHz. When I check the memory speed with Sandra 2000 or 2100, it says under mainboard info that the Memory Bus Speed is 125 Mhz. I wonder what HCLK +33M does mean. It can't be the FSB clock +33 MHz, becuase 83+33 is 116 MHz. It's not 33% because 33% of 83 is 27 and 83+27 is 110 MHz. So how come I get 125 Mhz in RAM speed? I have tested with 2 other motherboards and whatever combinations I make I can't figure out how HCLK +33M works, because I always get strange RAM speed. Like FSB 66 MHz + 33M = 108 Mhz, or FSB 115 MHz + 33M = 153 MHz etc. Could anyone please explain how this works. Or does Sandra show the wrong information? In that case, do you know of any program that can measure the exact RAM speed?
Thank you for your answer!

P.S. Thank you Tom for the great work you are doing. What would the world become without your guide!!!
 

ledzepp98

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Dec 31, 2007
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i know sandra isn't always accurate so i wouldn't take its measurements as fact. HCLK+33 does indeed mean host clock + 33mhz. for my thunderbird, the host clock is 100mhz (which is 200mhz ddr).i use the HCLK+33 to run the ram at 133mhz. if your fsb is 83 (which i believe should be the host clock) than i believe your ram is currently running at 116mhz.
 

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