"Memclock Index Value" setting in Bios

Question

What the heck is this one??
I thought that everything runs accordingly to FSB freq X HT multiplier
e.g.
200 FSB X 5HT = 1000 MHz Hypertransport
So is the "Memclock Index Value" setting in Bios meaning that someone can independently overclock hypertransport bus from
memory bus???...
confused 
Markoul

Answer 1

Memclock index value is the rate from where memory speed and divider is calculated .
You have to calculate what divider is being used , see examples.
FSB is the value where th hypertansort speed and cpu clock speed is calculated .
Eg 1.
HTmultiplier (HTm) = 4x
FSB= 250
multiplier = 10
Memory Index = 200
Result=
HT channel = HTm*FSB = 4x250 = 1000mhz or 2000MT/s
CPU speed = multiplier*FSB = 10x250 = 2.5ghz
Memory divider = multiplier x 200/Memory Index = 10 * 200/200 = 10 ( in this case divider is always eq. to cpu multiplier and some calls this 1:1)
Memory speed = Cpu Speed / Memory divider = 2500/10 = 250mhz or DDR500
Eg 2.
HTmultiplier (HTm) = 4x
FSB= 250
multiplier = 10
Memory Index = 166
Result=
HT channel = HTm*FSB = 4x250 = 1000mhz or 2000MT/s
CPU speed = multiplier*FSB = 10x250 = 2.5ghz
Memory divider = multiplier x 200/Memory Index = 10 * 200/166,67 = 12
Memory speed = Cpu Speed / Memory divider = 2500/12 = 208mhz or DDR416
Eg 3.
HTmultiplier (HTm) = 4x
FSB= 250
multiplier = 10
Memory Index = 133
Result=
HT channel = HTm*FSB = 4x250 = 1000mhz or 2000MT/s
CPU speed = multiplier*FSB = 10x250 = 2.5ghz
Memory divider = multiplier x 200/Memory Index = 10 * 200/133,33 = 15
Memory speed = Cpu Speed / Memory divider = 2500/15 = 166mhz or DDR333