Archived from groups: alt.comp.periphs.mainboard.asus (More info?)
In article <cstQe.firstname.lastname@example.org>, jerham
> We can't get the P4G8X board to even boot properly with an Nvidia 6600GT
> Tried bios setting 4x,8x etc
> Has anyone else tried this combo, or have any suggestions?
Intel doc 25193802.pdf (search for 251938 on the Intel site), lists
two errata for the 7205 chipset.
1. tVAL(min) Timing Is Not Meeting AGP 3.0 Specification
Problem: During simulation studies, it was determined that the AGP
signals were not meeting the tVAL(min) of 1ns.
Implication: AGP interface is susceptible to latching invalid data.
Workaround: Minimum trace lengths for the AGP common clock and
source synchronous signals have increased to offset this timing
violation. Refer to latest platform design guide.
Status: No fix planned for this erratum. Issue resolved by board
2. AGP Prefetch Cache Must Be Disabled
Problem: System hangs can occur during AGP transactions when the
AGP Prefetcher is enabled.
Implication: System hang.
Workaround: Disable AGP Prefetch Cache by clearing bit 0 of AGP
Miscellaneous Register (Device 1 Function 0 Offset A0-A3h).
Status: No fix planned for this erratum. System performance is
not affected by this erratum.
The first errata can be fixed by changing the length of the AGP
bus signals on the motherboard. The only question is, whether
Asus would have received that info before the motherboard was
designed. The doc was issued Dec4/2002. The Asus motherboard
manual was issued Nov14/2002, which means there is a possibility
the motherboard design wasn't corrected for that problem.
If you search over on Abxzone, there are several threads about
AGP 8X and P4G8X. Usually it is ATI 9700 cards that have trouble.
In one of the threads, there was the suggestion of adjusting
the AGP voltage a bit higher. Many of the threads mention running
AGP 4X, with Fastwrite disabled, as a fix for general problems.
The only suggestion I cannot agree with from those threads, is
cleaning the AGP slot with alcohol. This problem is not caused
by dirt. Better to drink the alcohol, than waste it on an AGP