zie http://www.viahardware.com
enVIA released a BETA driver patch today to help address some of the problems on AMD based VIA motherboards in WindowsXP. Though users are having mixed results with this patch, here is what our resident scripting guru, George Breese, has to say about the patch:
"This patch detects the 0305, 3099, 3102, and 3112 (KT133x, KT266x, VT8662, and KLE133) *only*. On these chipsets, it will patch register 55 in the Northbridge, which will supposedly switch off a Memory Write Queue timer.
In the KT133A datasheet, register 55 is "reserved". But - yikes! - in the KT266, the documented MWQ register is register 95, not 55. Register 55 contains unrelated DDR timing adjustments and could actually be dangerous to program. For this reason, I do not recommend installing this driver on the KT266x chipsets until VIA examines this issue. For now, use WPCREDIT and set bits 5, 6, and 7 to zero in register 95 instead."
This from VIA:
"So what does it do? It closes the RX55 memory register in BIOS. The RX55 register's official name and function is Memory Write Queue (MWQ) timer. The MWQ timer is actually a timing device included in the memory host controller to prevent write data being held in the memory queue too long. After the data has been in the queue too long it times out. This timed out data is then given a higher write request priority. Now that might sound nice a bit of extra performance BUT the procedure fails when overloaded. 3D games and Win XP put too much load on the memory queuing timer procedure. The nVidia new driver exaggerates the problem even more as the driver enables nVidia cards to use even more memory than previous driver versions. "
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