Hi...

Since there is no AMD751 (Irongate) .pcr Config File available, I worked out some Offsets of interest...

This is what I derived from the AMD Techdocs :
AMD 751 Chipset

Explanation of Terms :

Format :
xxh n,n = Offset xx and Bits n and n (as applicable)
> nn=Value Bits nn will cause associated Value with the labeled Feature

+ Optimum Setting for totally maximum performance (might crash though)
* AMD Recommended Safe Configuration

----------------------------------------

SD-RAM PageHit Limit (Max. consecutive Page Hits Allowed)
55h 7,6 > 00=1+ / 01=4 / 10=32* / 11=64

SD-RAM Idle Cycle Limit (Idle Cycles to wait before precharging idle Bank)
55h 5,4 > 10=48+ / 01=32 / 00=8*

SD-RAM TRC Bank Cycle Time (Minimum Time Activate to Activate)
55h 3,2,1 > 001=4+ / 000=3(Crash) / 010=5 / 011=6 / 100=7 / 101=8*

SD-RAM TRP SRAS Precharge (Delay Command to activate Command)
54h 7 > 1=2+ / 0=3*

SD-RAM TRAS (Minimum Bank active Time)
54h 6,5,4 > 000=2+ / 001=3 / 010=4 / 011=5 / 100=6 / 101=7*

SDRAM SCAS Latency (Delay SCAS to Data Valid)
54h 3,2 > 01=2+ / 00=3* / 11=4 :)

SD-RAM TRCD SRAS to SCAS (Delay Bank Activation to Read/Write Accept)
54h 1,0 > 01=2+ / 10=3* / 00=1(Crash) / 11=4 :)

SD-RAM Refresh Cycles
5Ah 1,0 > 00=2048+ (2K Refresh) / 01=1536* / 10=1024 / 11=512

HLT Disconnect Enable
62h 2 > 1=Enabled+ / 0=Disabled

AMD751 Super Bypass
61h 1 > 1=Enabled+ (Crash!!!) / 0=Disabled

==============================================
Personal Settings I found to run stable :
(MSI 6167, 1st Generation Board)

54h : 10000101 (=85h)
>>> TRP=2 ; TRAS=2 ; CAS=2 ; TRCD=2
(Max RAM Performance CL222)

55h : 00100010 (=22h)
>>> PH Limit=1 ; Idle Limit=48 ; TRC=4
(Max RAM Performance)

5Ah : 00010000 (=10h)
>>> 2K Refresh
(Slight increase in RAM Performance)

61h : 11001111 (=CFh)
>>> Super Bypass Enable
(Crashed, too old Chipset Revision)

62h : 10100111 (=A7h)
>>> HLT Disconnect=Enable
(Allows very effective CPU Cooling via Chipset, but can cause instability > Test for yourself)

Depending on the Bios you run, the ability to set CL222 Super Bypass, 2K Refresh and CPU Cooling can still give a nice performance boost and a much cooler CPU. (If your RAM and Chipset can handle it :)

Greetings
FalconFly
Homepage : www.falconfly.de
Email : falconfly@ewetel.net