Is that possibly DDR2? The CAS 5 smacks of DDR2. Either that or the memory really is crappy.
The Intel FSB can be confusing because they create the 800 MHz FSB by other means than simply using the memory clock. What can then happen is to have an 800 MHz FSB but a very poor memory bandwidth because the memory is only being clocked at 133/266.
Is it possible that you have something set incorrectly re the memory in the BIOS?? Have you tried running with "use SPD" and then try setting the CAS and other parameters separately?? Possibly memtest, only uses the SPD settings? Of this I am not certain.
The system comparison is with Memtest v.1.65:
1. AMD Athlon 3200+, Asus A7N8X, 1GB Corsair XMS Pro DDR400 in dual channel. CAS 3 3 3 8
Memtest shows the AMD system to have a FSB of 200, memory frequency at 200Mh as DDR400 in dual channel.
BIOS shows FSB = 200Mh, Mem. = 200Mh.
2. P4, 3GH, Asus P5ND2-SLI, 1GB Crucial Ballistix DDR533 in dual channel. CAS 5 2 2 4
Memtest shows the P4 to have a FSB of 200, memory frequency at 133Mh as DDR266 in dual channel.
BIOS shows FSB 800Mh, Mem. = 533Mh.
Why would the Memtest show such a week memory and FSB in the P4 system? Is there something that needs tweaking?
Thanks for any understanding you can provide.