Did some more testing with the Asus P5PE-VM and the Russian modded BIOS.
The first memory modules I tested were 2x1GB Infineon BE5, these caused 3d corruption in 3dmark2001 Draconic at 200+ MHz FSB using the 1:1 memory divider.
The second memory pair I tried, also Infineon BE5 (Corsair cmx1024-3200cpt xms3202v1.6) would not even boot Windows XP using the 1:1 divider at any memory timings.
Third pair i tried have Promos chips (Corsair cmx1024-3200PT xms3200v6.1), these do not seem to have 3d corruption issues when using the 1:1 divider, they will overclock some but not run tight sub timings.
The Asus P5PE-VM do not seem to like Infineon memory chips, at least not with the modded BIOS running at 1:1.
The P4 661 was seemingly stable at 4400 MHz, with the memory running at 392 but not at 4500 MHz with the memory at stock 400. I will try some core2-CPUs later.
Tested some more 2x 1GB memory.
Geil ge2gb3200bhdc (probably BE5) did not work very well.
A Qimonda set with Qimonda Rev C -5 chips worked fine at 200 1:1 with tight subtimings but would not overclock.
A Corsair Value set with remarked Qimonda chips did not work.
I tested two sets of Samsung UCCC, none would work at the 1:1 divider.
Another Corsair Value set with onknown ICs, no idea what they are corrupted the HDD.
With the first Infineon memory set I tried I could run a read delay of 4 both at stock 200 and overclocked to 234+ MHz FSB with the memory at the 1:1 divider (this is the "performance level" / "static read delay" setting). This made all memory benchmarks look great. None of the other memory sets so far have been able to run a read delay of 4 even at stock 200 MHz FSB.
I'm starting to think that some 3d corruption is an acceptable trade off for decent memory speed.
I have found a mismatched pair of Transcend + TwinMOS sticks, both modules probably have Promos chips. These works fine and overlocks to ~230 MHz.
I also found yet another Corsair Value set, these also seem to have remarked Qimonda chips but its hard to be sure, they diddn't work very well.
The conclusion seems to the that the Asus P5PE-VM with the modded BIOS hates Infineon BE5 but it hates most other memory ICs even more.
The BIOS modder either only cared about Winbond BH5 512MB sticks, had some magic 1GB Micron modules or focused on other memory dividers than 1:1.
New PC: i9 12900K @5GHz all cores @1.2v. MSI PRO Z690-A. 32GB DDR4 3600 CL14. 3070Ti.
Old PC: Dual Xeon X5690@4.6GHz, EVGA SR-2, 48GB DDR3R@2000MHz, Intel X25-M. GTX 980ti.
Older PC: K6-3+ 400@600MHz, PC-Chips M577, 256MB SDRAM, AWE64, Voodoo Banshee.