From what I can see Abit AB9 QuadGT having a 550-580mhz ceiling on max memory clocks depending on the memory modules is probably due to fact that default tRRD and tRTP are way too tight. If Abit adds all the sub timing options I proposed at http://i4memory.com/showpost.php?p=60109&postcount=6 then you probably be able to tweak the sub timings for tRRD and tRTP to allow a higher memory clock.Quote:
Originally Posted by bingo13
IIRC, on Asus P5B Deluxe at 540+ mhz memory clocks default tRRD and tRTP values are 10 and 10 respectively. While on Abit AB9 QuadGT the default tRRD and tRTP values at 540+ mhz are 5 and 7 respectively. It makes for fast bandwidth and PI times but probably limit max memory overclocks. More vdimm voltage will allow some modules to handle such tighter subtimings at higher clocks. So you may find same memory will need more vdimm to clock the same on Abit AB9 QuadGT as on Asus P5B Deluxe.
Hence, how high you can clock memory on Abit AB9 QuadGT would depend on how well your memory modules handle tRRD of 5 and tRTP of 7 on Abit AB9 QuadGT.
