Changing from 100FSB to 133 but...

[Akumu X]

Seeing as I am a broke young man.
On my (soon to be) 750 T-Bird it runs at 7.5x100 FSB (of course)
I have 133 RAM (thought it ran at 133) so if i went 5.5x133=731.5
would it bench around the same marks...you figure the MhZ is slower but the FSB is quicker? a little faster? a little slower? negligable?
Also, would I need an new cooler to do this? shouldn't should I? All done in the BIOS.

When I get money I'll o/c. For now just trying to get my RAM to work at 133 like I thought it defaulted at.
(by the way I got the 256MB of 133Ram Cas2 NS8 for $75(US)..not to shabby no?)

Thanks yet again all...

[stool]

The RAM isn't the problem, it's the FSB. As long as your mobo will accomodate the PC133, your RAM is okay. The multipliers you are talking about are for oc'ing your CPU. You won't really know what you are into until you really try.

[Akumu X]

so...since i have 133 RAM the mother supports 133 RAM (it says it in the manual...there's an option in the BIOS 100 or 133 100 is default) just set it to 133 and I'm good to go? running at 133?
damn...that's swift?

[Akumu X]

so...since i have 133 RAM the mother supports 133 RAM (it says it in the manual...there's an option in the BIOS 100 or 133 100 is default) just set it to 133 and I'm good to go? running at 133?
damn...that's swift

[SickBoy]

What motherboard are you running? if it's a KT133 it's not going to be able to do 133 MHz FSB even if the option is there. Assuming you have a KT133A based mobo, that has multiplier adjustments (and you've unlocked the multiplier on your chip via the pencil trick or similar), yes, all it is is a matter of setting your multiplier to 5.5x and your FSB to 133. This will give you 733 MHz. Make sure your ram is set to run at HOST CLK and not HCLK+PCICLK, as your host clock is now 133 MHz and running the second setting will run your RAM @ 166 MHz (which will not happen, I guarantee. Where's that CMOS clear again?) Run some benchmarks before and after doing this (Sisoft Sandra, 3DMark2K, P95, etc) and you will see that for most of those, running at a 133 MHz FSB is vastly superior to running 100 MHz FSB and running your RAM asynch at 133. If you're really a stickler about getting your full 750 MHz out of your chip, a lot of motherboards have adjustment of FSB in 1 MHz increments, so run your FSB at 133 + 4 MHz and you'll get about a 750 MHz total speed. To run this setting you may need to set your ram settings a little more conservatively (i.e. CAS3, disable interleaving, etc). Your chip should be able to stand a 50 MHz overclock though - i say just go 133x6 for 800 MHz. Let us know what happens, I hope I have been a help.

SickBoy

[Akumu X]

SickBoy (Mar 12, 2001 01:01 p.m.):
What motherboard are you running? if it's a KT133 it's not going to be able to do 133 MHz FSB even if the option is there. Assuming you have a KT133A based mobo, that has multiplier adjustments (and you've unlocked the multiplier on your chip via the pencil trick or similar), yes, all it is is a matter of setting your multiplier to 5.5x and your FSB to 133. This will give you 733 MHz. Make sure your ram is set to run at HOST CLK and not HCLK+PCICLK, as your host clock is now 133 MHz and running the second setting will run your RAM @ 166 MHz (which will not happen, I guarantee. Where's that CMOS clear again?) Run some benchmarks before and after doing this (Sisoft Sandra, 3DMark2K, P95, etc) and you will see that for most of those, running at a 133 MHz FSB is vastly superior to running 100 MHz FSB and running your RAM asynch at 133. If you're really a stickler about getting your full 750 MHz out of your chip, a lot of motherboards have adjustment of FSB in 1 MHz increments, so run your FSB at 133 + 4 MHz and you'll get about a 750 MHz total speed. To run this setting you may need to set your ram settings a little more conservatively (i.e. CAS3, disable interleaving, etc). Your chip should be able to stand a 50 MHz overclock though - i say just go 133x6 for 800 MHz. Let us know what happens, I hope I have been a help.

SickBoy

Thanks Sickboy the thing is, I just want to set it to 133FSB.
I can't overclock cause i don't have the tools (new heatsink/fan, pencil, artic silver, etc etc.) The mother is a KT133. no A after that I'm aware of. This can't do 133? Even though it is in the BIOS? Oh well...I'm **** outta luck. I can't overclock till i get some $$ to get the parts but since I have 133RAM thought I could do 133 at 750 w/o have to **** around with the multipliers. No possible eh? What's up with the post 2 posts up saying all I gotta do is set it 133 in te BIOS then? I'm confused...I don't/can't o/c yet. But wanted to set it at 133...no can do with a GigaByte-7ZX VIA KT133 chipset eh? sucks....oh well I'm sure it'll be a little quicker than the 500 PIII I'm on now.
Thanks anyways...

By the way...what would happen if i did set the FSB to 133 in BIOS? nothing? mother turn to blue smoke and blow out the vent? Curious...

[Yomama]

Here is the cheap way:

Using 133 requires an unlocked chip, so that you can adjust the multiplier down. All that that takes is a pencil to connect the tiny L1 bridges.

No extra cooling is necessary, as long as you stay in the same range as before (e.g. 750/733 would be ok). The processor does not care whether it runs on 100, 133 or 500MHz for that purpose, since the core will always run at 750 or higher, the FSB is masked by the multiplier.

In your case you may not hit 133, since it's not a KT133A board, but you may be able to get 109 MHz without unlocking the chip. If you can reach that without raising the voltage, which is likely, you will not need extra cooling either, but your processor will run at a nice 820.

Next is unlocking it, and trying to raise the multiplier. Instead of 7.5x100, you may be able to run at 8.5x109, which is around 900MHz - depending on luck you may get more. However now you are pushing the chip, and depending on your cooler you may reach pretty high temps. So get mbm from the links on the mainpage and monitor.

Good luck

Yo

[TheSlimOne]

I did that and only that so far with my Tbird 750 (100-133) Now its running 1ghz. But I have a KK266 M/B So it'll run 133 w/o complainings. The only ?? I can thing of? Why do you have to unlock the L1 Bridges to O/C the FSB. I have not done this yet. Its really weird How easily my chip did this . I didn't change anything axcept the FSB . NO VCORE , nuthin. Wonder what it would do if I unlocked it. Hmmm.. Thanks for the time

Slim

[TheSlimOne]

Wonder why it got a souble , sorry guys

Slim

[Akumu X]

you ain't throw a new cooler on that thing?
It runs at 1Gig fine?
(not that you're going to change my mind...I won't run this thing at a gig for 5 seconds and i know i'll hear a pop)
you're lucky though