jdmcnudgent said:now the 2.6 and 2.7 you are talking about, are they for the rdram voltages? i did not do this mod yet, but if i have to i will. also, do i need the speed error enabled or disabled in the bios. also too, i need to know what the differential current should be set at:4x,6x,5x,or 7x. and does the spread spectrum modulated need to be enabled or disabled? now, along with the differential current, what does my RDRAM need to be set at in the bios, auto, 300 or 400. and one last thing, is it better to use fix pci, or use the divider accordingly? thanks all.
Yes the 2.6 and 2.7 settings I was talking about was for the RDRAM. If you want to get your RDRAM speeds up over 533mhz then you will need to push the RDRAM voltage a little higher.
Leave Speed Error disable or it will error you everytime you boot with the CPU overclocked.
Differential Current is a puzzle to a lot of ppl but can be eaily expained. Basically the RDRAM has a voltage request of 2.5v. That is on both the + and - polarity. that gives a differential current between the 2 max request at 5x (+2.5 and -2.5). When you boot with defaults Abit has this setting set to 6x meaning they are allowing for a max differential current spread of 6x or +3 and -3v. This is only to allow for transiant flux of the voltages which could be sent. So if you det it to 6 normaly and have not done the mod then you will see an average of around 2.54v for your RDRA< with the clearence for 3v. This doesn't mean that you will still be able to hit the higher speeds because you have to higher difference in spread tho. But with the vrimm mod you can adjust you vrimm voltage up some and still fall with in the differential swing at the default 6x setting. The higher vrimm voltage will then beable to have the same basic affect on the RDRAM as the vcore voltage mod has on the CPU. Leave this one set to 6x and you should have no problems.
As for Spread Spectrum Modualtion. I've covered this in other threads before but basically what it does is acts as a filter to clear out over frequecy spikes on the data signal wave thus cleaning it up and giving a more square and solind data signal. This then cuts down on crosstalk in the chips thus allowing for lower level of data errors when running at higher speed. Leave this setting enabled when ocerclocking your RDRAM.
As for your settong for the RDRAM itself. If you have not done the vrimm vmod and you are trying for higher rdram speeds then you may be able to see 133mhz or just above that. It depends on the rdram that you have tho. With that set it to 400. If you plan on doint the vmod and staying under 150mhz FSB setting then leave the setting at 400. If you plan on going higher that 150 then shift your setting to 300. This will slow you rdram some but will inturn allow for a wider transfer. With your 1.6a on a vapo you should be able to hit FSB speeds and cpu speeds of about 2800. This will give you a FSB setting of 175mhz. With that then your RDRAM at 3x would be at 525mhz which that 525mhz will out perform a 533mhz 4x setting of 133nhz x4. In fact it should out do a setting of 4x140mhz.
