WHY CAN'T I GET A FSB OF 133???

[typer]

I was wondering if anyone could tell me why I can't get a FSB of 133?? So far the fastest I've been able to get without my computer crashing is 120. I have a 1.2 Ghz t-bird with a 266 fsb, an ASUS A7V133 motherboard, 256 megs of generic PC-133 CAS3, and a 300 watt power supply. Originally I was running at 1200 (12 x 100), with the Vcore setting on auto. If I'm able to run 12 x 100 to get 1200, shouldn't I be able to run 9 x 133 to get better performance and still equal 1200???? Can anyone tell me if it's because of my generic RAM, or do I need to increase the Vcore setting???? Right now I have my computer running at 11 x 120= 1320 with Vcore setting at auto still and stable. Should I keep my computer like this until I find a way to increase the FSB, or should I go back to the original 12 x 100. I'm a newbie to all of this so sorry if these questions sound dumb. Any help at all to get me in the 9 x 133 range or the 10 x 133 range would be greatly appreciated. Thanks ahead of time.

Joel

[DE]

typer (May 02, 2001 04:55 a.m.):
I was wondering if anyone could tell me why I can't get a FSB of 133?? So far the fastest I've been able to get without my computer crashing is 120. I have a 1.2 Ghz t-bird with a 266 fsb, an ASUS A7V133 motherboard, 256 megs of generic PC-133 CAS3, and a 300 watt power supply. Originally I was running at 1200 (12 x 100), with the Vcore setting on auto. If I'm able to run 12 x 100 to get 1200, shouldn't I be able to run 9 x 133 to get better performance and still equal 1200???? Can anyone tell me if it's because of my generic RAM, or do I need to increase the Vcore setting???? Right now I have my computer running at 11 x 120= 1320 with Vcore setting at auto still and stable. Should I keep my computer like this until I find a way to increase the FSB, or should I go back to the original 12 x 100. I'm a newbie to all of this so sorry if these questions sound dumb. Any help at all to get me in the 9 x 133 range or the 10 x 133 range would be greatly appreciated. Thanks ahead of time.

Joel


Is that Asus a kt133 or kt133a board? If its a kt133 then that's your problem, they simply can't go very high. Otherwire if you have a kt133a mb then set your chip to the lowest mult. and you should be able to hit 133, just make sure the ram is set to cl3 or cas3 in the bios.

Dylan

[oc jason]

what joel said is right id you do have the 133a then maybe its you GENERIC ram that is holding you back,-try the lowest multiplier setting with 133 FSB then just up the multiplier as high as you can

[Mike734]

If you truely have a 266 T-bird then 133 FSB is not even overclocking. It must be the MB is not a 133 (A). If it is an (A) chipset then it is probably faulty. Oh, check that you are not running your pci busses too fast. There may be a divider function in your bios. When you step up the FSB you must use a different divisor for the pci bus. Some body check me on this.

[JimmyG]

When you get over 125 FSB, then the PCI freq automatically drops to 33 according to the manual.

[Goldwing]

First the motherboard is a KT133a board so that shouldn't be the problem.

Try removing all the cards except for video and ram. Then try to up the fsb to 133Mhz. If this works add the cards back until you have identified the culprit.

You might also try booting to 9x100Mhz first to verify the multiplier isn't the problem. Then reboot and change the fsb.

Another tactic would be to change the speeds with the jumpers.

Good Luck. :)

[FRANK]

First of all this may not apply to you but, ASUS has two different "A7V" motherboards out at this time. The first one simply named A7V. Since this was one of the first generation of the socket "A" motherboards that use the VIA KT133 chipset. This board suffers from some of the common problems that afflict all other boards with the this chipset. One problem is that, although the BIOS, as well as the jumper settings on the board show a 133FSB option, the most that you can expect to achieve will be in the 107 / 110MHz range.

Anticipating the coming 266MHz CPU's, VIA redesigned the chipset to support an FSB of 133MHz+. The confusion comes from the way that ASUS named their new board, While most other motherboard manufacturers used the letter "A" in the names of their second generation boards with the KT133"A" chipset, ASUS didn't.

Simply put;
ASUS A7V = KT133 chipset
ASUS A7V133 = KT133A chipset.

If you do have the A7V133 with the KT133A chipset, you will have to verify that you do in fact have 1.2gig 266MHz CPU. Look at the codes on the top of the die, yours should say something on the order of;

AMD Athlon
A1200 xxxxC.................<A1200 = 1200MHz xxxxC = "C" code 266MHz FSB, "B" = 200MHz FSB
AXIA xxxxxxxx................<AXIA = stepping or batch code, AXIA most desirable, AVIA next
xxxxxxxxxxx
C 1999 AMD.................<1999 = patent date not manufacturing date.

If you have a "B" code (200MHz FSB) CPU, there is an issue that needs to be addressed on some motherboards that use both BIOS adustments and jumpers, ASUS included, I believe. When initiating the boot process the BIOS looks to the default multiplier settings of the CPU during the initial post. This means that with a 200MHz cpu the default setting would be 12X, resulting in almost 1600MHz, way too high. This is explained in much more detail and with possible solutions at this link;

http://www.anandtech.com/showdoc.html?i=1440

I hope this helps, if it doesn't apply to you, maybe somebody else reading this thread will benefit from it.

Good Luck!

.

[Mosquito Fly]

I believe that mobo has a jumper that you have to switch to go fsb133 and over. Check if you haven't.

[Goldwing]

There are dip switches (in jumper mode) which will set fsb to 100, 103, 105, 110, and 133. Any other fsb requires jumperfree mode.

[typer]

Are you guys saying I should get out of jumperfree mode and adjust the jumper myself to 133? Thanks