by congo » Sun Mar 26, 2006 2:47 am
The HTT is the speed at which the cpu communicates with the motherboard. While different than a traditional Front Side Bus, (FSB), a higher HTT speed will increase overall performance in much the same way as raising their FSB in the past did.
The guy meant a maximum of 305mhz. He is whining that he can't go higher! That gets factored by a bus multiplier.
Stock speed of the hypertransport bus (HTT) is 200mhz, so if a 5x HT multiplier is used, the HTT speed (FSB speed) will be 1000mhz. 200x5=1000
Say that person wanted to set a 3x HT multiplier, he would get 305mhz HTT x 3 = 915mhz HTT which is somewhat below the aim of keeping the speed at or near 1000mhz for best performance.
A 4x multiplier would put his HTT speed at 4 x 305mhz = 1220mhz, which will most likely be quite unstable.
But that is just part of the reason.
300mhz is a 50% overclock. I run mine at 266mhz. 266x4=1064mhz
Going much over 1000mhz will make the PC unstable, so why the 266mhz x 4 instead of 200mhz x 5 ?
The stock base speed of 200mhz HTT affects the
CPU and RAM as well.
The CPU is affected like this:
Say you have a CPU with a 11x speed multiplier like a 3700+......
11 x 200mhz HTT = 2200mhz stock standard cpu speed
11 x 266mhz HTT = 2926mhz highly overclocked cpu speed
...... this results in massive CPU overclock.
It also results in a RAM overclock, and this is why you see RAM above the PC3200 specification... ie PC4000 which is rated to 250mhz HTT speed.
Ram speed at stock = 200mhz which is 400mhz DDR or PC3200
Ram speed at 266mhz HTT = 533mhz DDR or PC4200
Now back to the person who wants to run at over 300mhz HTT speed.
Say they have a 3000+ CPU that has a top locked multiplier of 9x.
Last edited by
congo on Sun Mar 26, 2006 5:56 am, edited 1 time in total.

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