hi all ,
1st of all i ask this in oc forum bcos i believe here got more experience dudes in ram speed bottleneck.

for phenom 955 which is on 200mhz x 16 = 3.2ghz, means tat the ram only run as 800mhz or 1600mhz,
so i wonder if i put it on ddr3 1333, will it be slower than a ddr2 800 ( as ddr3 latency higher)

so if there is any good solution to make phenom 955 runs good wif ddr3 1333 ram ?

This post has been edited by WhiteFlag: Aug 21 2009, 12:15 PM

Phenom 955 can run seperate NB frequency (affect RAM speed) than HT frequency (affect CPU speed)

It depend on the which divider you use in bios. Maybe you can check the ram speed at bios ?

Ex:

X4 (4 Cores) 3000mhz (Per CPU Core) 1800mhz (CPU-NB) 1800 (Hyper Transport) 200Mhz (HTT) 1066Mhz (Ram)

Sandra Mem Bandwidth : 7000Mb
SuperPI :20 seconds

Or you can gain another 500mb or shave 1-2 seconds without the raise of CPU Clock Speed by;

-Raise CPU/NB up to 2400 using stock volts (1.1v)
-Raise Mem Speed to lets say 1200Mhz
-Raise HTT around 225

All three combo increases performance which can be seen in benchmarking tools...

har?
then y when i increase the HTT speed, originally its 200mhz,when i increase the HTT the cpu clock and mem clock and HT link all increase as well?

Yap...because it is linked all together via multplier...

Lets say 200HTT 1800 CPU/NB 1800 Hyper Transport;

when u raise 10HTT the CPU/NB and Hyper Transport also raise accordingly but is multiplied... 1HTT will be times 10 if u use 10 multiplier...if u use 12 then (HTT value will) multiply with 12....

Some reads the CPU/NB Frequency by multiplier and some by the speed...but both is actually the same thing...

When u put CPU/NB at 12, lets say u run 200HTT ur CPU/NB frequency will be operating at 2400mhz...if u use 10x multi, it will result to 2000mhz frequency speed...

thn how many multipliers are there?
is it 3 types of multiplier: cpu, nb (ram) and HTT ( core to core)
?
? ?

yes 3 set of multiplier --CPU speed, NB speed & HTT speed
and
2 set of divider --CPU divider, RAM divider

confuse enought?