760+T-BRED OR KT133+T-BRED?

[sTevenX]

Could you please give me a suggestion of this:
I have a mainboard with AMD760 chipsets and another with KT133 chipsets, I want to upgrade my CPU to T-BRED 1.8G Mhz.
Can my old mainboards support this CPU? Can a T-BRED 1.8G work under 1.75V?
THANK YOU VERY MUCH

 

[phsstpok]

I've been reading on Google groups (Usenet) about people getting Tbred 2400+ working on a KT133 mobo (Abit KT7). Seems the Tbred 2100+ and higher are desirable because they are unlocked <b>and</b> they have the 5th multiplier (8+) bit enabled by default. This means the multipliers get remapped on old motherboards like the KT7. Even though the KT7 has BIOS settings for 5x-12.5x you can actually get higher multipliers 13x and up. For example, a 2400+ can be run at 20x100 for stock speed (2.0 Ghz) or even overclocked to 24x100.

The problem with an 1800+ (or any XP below 2100) is the 5th bit is not enabled and getting it to work at full speed on a KT133 mobo is more of a problem. The reason for the limitation is now you only have the 5x-12.5 multiplier choices. With FSB limited to about 116 Mhz the max speed would be 1250 Mhz not overclocked or 12.5*116 = 1450 Mhz if overclocking FSB. Some KT133 mobo won't even reach 116 Mhz FSB. (My KT7 would only do 106 Mhz before becoming unstable).

<b>99% is great, unless you are talking about system stability</b>

 

[sTevenX]

Thank you very much.
And I wonder whether my MB with AMD761+686B chipsets can support 1.8 or even 2.1G TBRED. I'm in guangzhou and I found some new 1.8G TBRED with TBRED-B type core, it is unlocked, so is this kind of B core TBRED open the 5th multipier?

 

[phsstpok]

Don't know about AMD 761 but KT133 definitely does not support Tbred at least not officially. That's not to say the combination doesn't work. It does in many cases but it takes some effort.

Tbred B 1800+? I thought the 1800+ was Tbred A and Palomino only. No matter, still would have the same problem. The 5th multiplier bit is not enabled so you are stuck with 5x-12.5x with FSB at only 100 Mhz, unless you mod the chip.

<b>99% is great, unless you are talking about system stability</b>

 

[sTevenX]

Thanks.
There are some 1800+ with TBRED-B core appear in our market I finally bought a 2000+ and found it works well on my old 761 mb...Maybe...afterall 761 is AMD's chipset so I even don't need to flash my bios. But there's another problem, my mb don't support changing the ratio of the CPU, so I can reach 12.5X133 at the most, can I modify the ratio with softwares like CPUFSB? But CPUFSB doesn't support my mb.

 

[phsstpok]

Try SetFSB. The link I had is dead but try the one below. There are two versions of SetFSB for AMD 761 + VIA 786B mobos. Don't know if yours is included as you didn't say which mobo you own. The programs should work if your mobo has one of the right clock generators, ICS94225, ICS94240, or ICS9248BF-153.

SetFSB
<A HREF="http://www.maximumoc.com/setfsb.html" target="_new">http://www.maximumoc.com/setfsb.html</A>

<b>99% is great, unless you are talking about system stability</b>

 

[sTevenX]

The GA-7DXC version of SETFSB can support my MB, but still... it only allow me to modify the bus ratio and at the most reach 150MHZ. Is there anyother way that I can set the ratio more than 12.5X?

 

[sTevenX]

The GA-7DXC version of SETFSB can support my MB, but still... it only allow me to modify the bus ratio and at the most reach 150MHZ. Is there anyother way that I can set the ratio more than 12.5X? Thank you

 

[phsstpok]

Sorry, I misunderstood your request.

I have not heard of any programs that can change the mulitiplier via software. I don't think it is even possible.

Is there a BIOS update that would allow higher multipliers for your motherboard? This would be the best choice.

You could try cutting the 5th L3 bridge. If your motherboard does not understand the higher multiplier bit what you might get the remapping thing just like with the KT133 example. I'm not sure what default multiplier you would end up with. It might be something that just won't POST, like 24X. 24x133 would be a ridiculous 3200 Mhz. That would be bad.

You could modify the default multiplier on your Tbred. This involves cutting and reconfiguring the L3 bridges plus the L11 bridges if you want to increase the default VCore voltage. You probably have to lock the processor by cutting L1 bridges as well. See <A HREF="http://www.ocinside.de/index_e.html?/html/workshop/socketa/tbred_painting.html" target="_new">OCInside.de's Tbred Painting Guide</A>. I'm not sure this method is even possible. Otherwise you could just drop a high speed Tbred into you mobo. The kicker is you said your mobo is limited to Athlon XP 2000. Don't know if this bodes well for the higher multipliers.

I don't know if there is any other way.

<b>99% is great, unless you are talking about system stability</b><P ID="edit"><FONT SIZE=-1><EM>Edited by phsstpok on 01/28/03 02:39 PM.</EM></FONT></P>

 

[sTevenX]

I have updated my bios and found nothing changed in BIOS menu -.-!! Thanks a lot for your answers, I will try your method

 

[phsstpok]

Before you do any bridge cutting you might want to check out Wes Newell's website, <A HREF="http://mysite.verizon.net/res0exft/" target="_new">http://mysite.verizon.net/res0exft/</A>. He's produced/collected a lot of good notes.

Here's one more good link.

<A HREF="http://www.beachlink.com/candjac/TbredDecode0.htm" target="_new">http://www.beachlink.com/candjac/TbredDecode0.htm</A>

Personally, I'm having trouble understanding all the information but it is interesting.




<b>99% is great, unless you are talking about system stability</b><P ID="edit"><FONT SIZE=-1><EM>Edited by phsstpok on 01/31/03 02:22 PM.</EM></FONT></P>