Another fsb question, good one though i hope...

[Balael]

I am running a duron 600 on a kt7a, my question is, if i set the fsb to 150, and then add the multiplier of 6, that would be 150 x 6 =900, but i can also run it at 113 x 8, which about gives me the same, and i still run my ram at 150 mhz because i switch it to host clk, plus pci clk, i guess what i'm asking which one is faster? does it matter on a 100 mhz fsb processer that i have my fsb at 150, or 113? any helps appreciated.

balael

 

[MCS]

Seeing as you have a KT7A then yes of course having 150FSB is going to be faster than 113.

 

[Tachyon]

The higher your FSB the higher freq your periphials run at. You get much better memory bandwith at higher frequencies.

 

[Balael]

yeah, i know, but my pci clock at 113fsb is 37, my pci clock is also 37 when my fsb is 150. I don't know, i'm confused now.

heh

 

[MCS]

At 113 FSB your CPU will be using a "DDR" bus of 226Mhz, whereas at 150 FSB it will be much higher at 300Mhz.

Also, if your memory will be running at 150Mhz FSB and this will give you more bandwidth than 113 FSB.

 

[Balael]

oks, so if my fsb is 150, then my ram has more bandwith then if i had my fsb at 113, but my ram was still at 150mhz? Gotcha, just kinda weird to me is all, i guess i'm just gonna see if i can handle stick with 900 mhz on my 600, hell it's still at 1.5v.

balael

thanks for the help

 

[Tachyon]

I see your dilemma! At 100MHz the PCI divider is 1/3=33MHZ. At 133MHz the PCI divider is 1/4=33MHz. This was to prevent PCI cards and HD's from running at high frequencies. A lot of old ones were frequency intolerent. That's why your RAM is at 150MHz when you have host+pci clock selected at 100MHz. Clear as mud??

 

[Tachyon]

Forgot one thing...your memory bandwidth won't change, but your overall system will run faster...as long as the other periphials don't have a problem with the higher frequencies.

 

[MCS]

Yeah you've got it

Just remember whatever your FSB is set to, times it by 2 for the Athlons bus speed.

 

[Tachyon]

NOOOOO...all the 200 and 266 means is that both the rising and falling edges of the clock cycle are utilized. The FSB speeds remain the same. Otherwise, with the PCI at 37MHz you're saying that the "real" PCI speed would be 72MHz....way out of tolerence for even today's PCI cards and HD's

 

[Tachyon]

Unless...that's what you meant Then an unequivocal yes!

 

[her209]

Higher FSB is usually better. Example is the a P3 chip with E and with EB.

 

[MCS]

Tachyon - you're right, I agree with you.

I knew what I meant I just didn't "word" it extremely well

 

[Tachyon]

After re-reading your post I thought that was what you meant