Originally Posted by snorre
That's not correct, the VIA K8T800 works perfectly with DDR400 (PC3200) memory at full speed. The Acer Ferrari 3200 uses this chipset too and that runs DDR400 memory without any problems
The K8T800 chipset needs a BIOS update to work with that, which Arima has not released. Again, it is a chipset problem that Via has with that chipset that the ODMs have to patch with a BIOS update to fix.
You can run DDR400 if you use only one DDR400 SODIMM. Run two and Windows will not boot. AFAIK, this is an issue with the Athlon64 on-die memory controller not actually working with the Ras-to-Cas delay (tRCD) that it reads from SPD when there are two sticks of RAM. AFAIH, the root cause of the issue is that very few sticks of RAMs actually hit their rated latencies spot-on. This degree of "fudge" is normally absorbed by the extra link between the RAM-Northbridge-CPU path, but it is unforgiven in the case of the direct RAM-CPU path of Socket 754.
Even new motherboards run into that same problem until it is fixed. For example, Kyle Bennett ran into that same problem with the MSI K8T Neo2-FIR , a desktop socket 939 MB using the K8T800pro
, which is an updated version.
"With all four memory slots filled with a mixture of 512MB Corsair XMSDDR3200LLPro DDR400 and Kingston PC3500 HyperX DDR400 modules, the board was fully stable with one minor quirk. I could not get the memory to run at a true 400 MHz speed (200 MHZ FSB). If the memory bus was set to run at 400 MHz in the BIOS with all memory slots filled, the BIOS would force the memory down to 200 MHz speed (100 MHz FSB). The fastest setting I could get the memory to run at with all 4 slots filled with double sided 512 MB DDR modules was 333 MHz (166 MHz FSB). After doing some research, I found out an interesting fact concerning this board. According to the K8T Neo2’s manual, you can only run at 400 MHz (200 MHz FSB) with all slots filled with single sided DDR400 modules, usually available in a maximum 256 MB size."
The Acer Ferrari does use the K8T800 & runs at 200FSB, but only because of its decision to fix that problem that almost everyone has agreed to fix (not Via) at the ODM level, but not Arima.
If you look at the Arima W730-K8 on their website, even Arima shows the notebook will run only at DDR-333.Arima Global
It's nice, don't get me wrong. But their solution is running slower than others, all stemming from an institutional problem started at Via that the ODM's fix at their factories by releasing a BIOS update. The fact that it is still there (in the K8T800pro) says something to me about Via.