Video cache mode

[Rick]

Was going through my P3V4X's manual. I came across a feature called Video Memory Cache Mode. It said to set it to USWC only if your video card supports it. Does the G400 support this and more importantly what does it do?

tks

Rick

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ASUS P2B,Celeron 366@550, 2.26v with Golden Orb, 128mb PC133 Crucial RAM, G400 DH, Maxtor 7200rpm 10GB, 4.3GB Fujistu, Creative 24x, Creative X-Gamer, NIC (DSL baby!), ISA Modem

[Rags]

Hi Rick,

USWC is write combining, set it to on with Matrox cards, they support write combining. This will speed up video operations, BUT some systems can't handle USWC being set to on. Set it to on and run some stuff and see if you are still stable, if so keep it on, if not turn it back off.

Rags

[Gurm]

UC = Uncacheable
USWC = Uncacheable, with Speculative Write Combining...

This is essentially the feature that was enabled by the program "fastvid" for pentium pro and early pentium 2 systems (using the FX chipset).

What it means is that the BIOS and/or CPU get to decide when there's a whole bunch of reads/writes that can be merged into one operation, and do so to speed up accesses (since most of the time in any kind of computer data transfer is spent getting ready to receive data and verifying that the data has been sent).

Cards which currently are KNOWN to support this feature are the G400, and all ATI cards since the first Rage chip (maybe even the Mach64, upon which the first Rage was based).

- Gurm

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Listen up, you primitive screwheads! See this? This is my BOOMSTICK! Etc. etc.

[Guru]

The G200 allsow support this feature!

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PIII450@558, ABIT BX6-2, 256RAM, G400MAX, SBLIVE, HOTROD-UDMA66

[jediphoenix]

how do you enable this feature in win2k pro for the G400?

K6-2 450
128 megs sdram
G400 32 meg
FIC PA-2013 rev 2.1

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[Tseng]

It is an option you can set in BIOS. Nothing to do with Win2K.

[Gurm]

Some BIOS's have it, some don't. I don't know if the ones that don't do auto-detect or what... I suspect not.

- Gurm

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Listen up, you primitive screwheads! See this? This is my BOOMSTICK! Etc. etc.