280+ for Mem can not start windows and sometimes needs clear CMOS, 279 can go in but the login windows fails, 278 can login but memory testing fail. for both 278&279, they fail at BSOD and tell me the memory management errors. 277 can do most of the things, but not stable. conservative setting is 275Mhz(2 Mhz less than the 277) at this time, even can use 2.5-4-4-7 aggressive timing. at this speed in my rig, it is stable and can pass the prime95 memory test but the cpu will fail after around 1 hour. when playing games, the nv_disp.dll error will come out.@ 273Mhz(274 Skipped) can pass both cpu and mem prime95 test (more than 5 hours testing for both). even so @270 game is always a headache due to the nv_disp.dll.
conclusion and analysis: (1)so far this board can only support 2.8v for mem, in the future if in any chance 3.1v is provided, it is very likely that the mem can run @290Mhz with 3-4-4-8(maybe a little cooling needed). (2) the possible reason why game always trouble the system is maybe because the HTT(hypertransport) link between Mem and AGP. explanation: from 270-273*9, it can pass all the tests including prime95, sisoft sandra burn-in test, 3dmark03 and aqua mark(cpu:mem=1:1 timing is either 2.5-4-4-7 or 3-4-4-8). prime95 can prove that the connection between cpu and mem is ok and both of them can function perfectly @ this speed. i search all of the google about this problem, it seems no solution so far. no matter it is infinite loop error or non-paged area or some other errors ,the error codes returned all point to the same memory location BFxxxxxx which is nv_disp.dll. can we blame Nvidia? No, Ati cards also have the same problem in a lot of cases. it doesn't make sense that under 247*10 D3D game can work but under 273*9 it can not. so i come to suspect the link between agp to cpu and mem---Hypertransport. accoding to the hypertransport consortium, it can run under 1.2volt @ 200 400 600 800 Mhz which are all basing on the 200Mhz just multi-channel. maybe 250Mhz+ is too high for Htt for the base bandwidth. that is why most of the board can adjust the htt voltage under bios settings. Abit K8vPro can adjust htt voltage from 1.2 to 1.35 at 0.05V step. even so, i am not very sure if it can make gaming smoothly @ 270Mhz+ fsb under high voltage. Due to the fact my PSU is just a 400W one, the power drain is so great that my rig can not work stable @ this power consumption. i did not try it too much, only adjust the htt voltage to 1.25 volt but my rig fails again in gaming@270Mhz. (3)finally i would like to say with a good PSU and Casing and maybe a better cpu fan, with higher Vdimm(mem voltage)@3.1v and higher Htt voltage maybe 1.35v or 1.4v, we can make it work @285-295*9 crazy speed for both cpu and mem(ratio 1:1).
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