Asus Crosshair IV 0801 Bios

[MrIcee]

Efficiency at high ram speeds is horrible compared to 790FX boards... was about 5-8secs difference in pi32mb with a 790FX and 890FX at +1900mhzC7. I'm thinking this high ram speed stuff is overrated...

Hi my friend

There is definitely a ways to go yet with bandwidth efficiency with the CH4 bios. In saying that, it still holds true that to take advantage of high ram frequency, we still need the capability to run the NB at twice the ram frequency. As with earlier Phenom II's, it is next to impossible unless under LN2. With my current Thuban, a little over 3200Mhz is max even under a 404A Prommy, which at 2 to 1 makes 1600Mhz ram speeds with tight timings the most efficient theoretically.

The inefficiency of the mem subsystem archictecture harkens back to the original Athlon days, when the L2 was off die. When it was moved on die, and finally at full processor speed we finally had something. Then the A64 architecture took it a step further and we were eating P4's for breakfast I have not gotten too excited with the 2000Mhz+ speeds on this platform yet because of the inability to scale the NB higher. Without that ability, high ram frequency, it seems, or the ability to run it, is only eye candy and this platform is not fully capable of utilizing the bandwidth that it can produce.

Best regards,

Randi