Cpuz report my RAM different than what my board reporting.

[Bad Dude]

Here's my system specs:
DFI nF4 Infinity SLI. BIOS_CK8LD410
Athlon64 X2 3800+ OEM @2400Mhz.
2X1Gig OCZ Platinum PC4000.
2X250GB Seagate SATA drives in RAID 0.
300GB EIDE 16MB.
eVGA 7800GT PCI_E 256MB.
Sound Blaster Audigy 2.
PCI Hauppauge TV Tuner.
USR PCI Modem.
Chieftech Matrix server case.
Antec True Power 2 550W.
Floppy.
NEC DVD+/- 16X DVDR burners.

I got DDR500/PC4000. However, I ran the processor at 8X300 with RAM divider at 166 which should give me 250 for the RAM which equal to DDR500. The system says it's so when booting up reporting by the board, but Cpuz, Clockgen says it's only 240 which only 480 for the RAM.
I would like to know why this is so, and if there is any program that can report the correct and real HTT clock for my system? Also, which to believe? I think there might be deficient about the chipset running the RAM.

Thanks.

 

[2kfire]

With Athlon 64 CPUs, memory speeds are a result of dividing the clock speed of the CPU and not the "FSB" (since they don't really have an FSB). Since you have to have integer dividers, some CPUs can't perfectly match the memory speeds. Ex: 3500+ (@2.2GHz) uses a divider of 11 to get 200 MHz. To get 166, the closest divider would be 13, but that actually gives 169 MHz (2200/13). In the case of your CPU, it's being overclocked to 2400 MHz. To get close to 250 MHz, you would have to use a divider of 9, which would give you 267 MHz (too high), or 10, which gives you 240 MHz (too low, but safer than 267). So, your memory is actually running right at the correct speed.

Source: Text

If you really want your memory to run at 250 MHz, your CPU speed would have to be 2500MHz with that same divider. If your cooling is good and your voltage is still low (<1.45), let'er rip!!!

 

[Bad Dude]

Thanks for a great explanation.