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Correct CPU for

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July 3, 2003 7:22:16 PM

Any of yo geeks know what the fastest Athlon is that will go into a Abit KR7A-Raid MB?

More about : correct cpu

July 3, 2003 7:54:44 PM

According to Abit's web site, your mobo supports up to XP2100+ of Palomino Core, and 2000+ to T-Bred Core
July 3, 2003 8:15:02 PM

With BIOS B5 . . .

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July 4, 2003 2:36:48 AM

Exactly
July 4, 2003 12:06:32 PM

Thanks for your help.
Damn, I was hoping the MB could use a faster CPU than that :[
July 4, 2003 2:36:44 PM

I would say get a Athlon XP 2000+ with T-bred core, then try to Overclock it to higher speed
October 4, 2003 7:16:37 PM

I've got a XP 1800+ cpu which wont o/c, is it worth getting an 2000+ what can I expect to get it up to? I have got stacks of fans etc..
October 4, 2003 7:48:38 PM

I don't think anyone should reply to posts like that. How long did it take you to find that info? 2-3 minutes maybe? Why the person who started this topic didn't do a little research before posting?
October 4, 2003 7:59:42 PM

Quote:
I've got a XP 1800+ cpu which wont o/c, is it worth getting an 2000+ what can I expect to get it up to? I have got stacks of fans etc..

This on the other hand is a question I would happily answer. Don't take my previous post the wrong way, I hope you got my point.

Anyway, basically you are stuck with your current processor. If you upgrade to a 2000+ from a 1800+ you will barely see any increase in performance. You probably won't be able to overclock it either, because even if the CPU is able to clock higher, your mobo isn't because of the chipset it has.
October 4, 2003 8:30:56 PM

Hi, i have the same board with a 1600+ athlon in it and ive been wondering the same thing.Surely wouldnt the motherboard be capable of supporting any athlon xp that runs at 266 FSB and not the newer barton cores that run at 333 FBS? Or are you guys telling my if i get such a processor like a athlon 2400+xp it wouldnt even post at boot up and i would get some sort of black screen?
October 4, 2003 8:53:15 PM

The Athlon XP runs up to 2600+ @ 266 FSB but you have to make sure your BIOS is up to date.

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October 4, 2003 9:34:01 PM

hi, just asking out of curiosity not to flame cause im a noob :p  but,anyways why does the BIOS need to be up to date? i thought on some boards updated BIOS just showed the correct CPU speed at post. if you look at the abit website it looks like the real BIOS support for that board was dropped about a year ago before the newer CPU's where out. Isnt the VIA KT266 Chipset capable of supporting higher clock cpus.There are other brands like msi and asus that might of used the same chipset, and arnt the CPU voltage and multiplyer speeds detected when you turn the computer on regardless of how old your BIOS is? Thanks for your response anywho i really dont know what im talking about, but maybe you oldtimers here can help me learn about these things :) 
October 4, 2003 9:34:03 PM

Abit says the following in their website for this mobo:

BIOS ID: B5
Support AMD Athlon XP CPU, 0.18 micron process Palomino up to 2100+ and 0.13 micron process Thoroughbred up to 2000+.

Nothing else is mentioned on CPU support.
October 4, 2003 10:58:19 PM

There's an interesting thread at AMDMB.COM discussing this very issue (see link at the very end). It's very long but there's a lot of information ranging from FUD to the latest (and accurate) mod tips.

The processors do work (or can be made to work) in almost all Socket A motherboards. For example, for a short while I was running an XP2400+ in a Abit KT7, not KT7A. The KT7 is more than a year older the KR7A and three chipset generations older (KT133, KT133A, KT266 before the KT266A) but it still worked. Sure the KT7 (KT133 chipset) can only run a 100 mhz (200) bus but XP2400+ booted happily at 20 * 100 which is still the stock speed of 2000 Mhz for an XP2400+.

Take a look at the AMDMB.COM thread. Skip toward the end (past the FUD). You will see people using Tbred B XP2100+, XP2400+, XP2600+ (266), XP2600+ (333 - using mods), Barton XP2500+ (w/ PC2700 memory), overclocked XP2500+ (using mods). Some people are using ver 1.0 of the KR7A, some later versions.

Just upgrade the BIOS to CX or later and install one the 133 mhz (266) processors and it will work, no mods necessary, and at full speeds.

If you want to overclock you should read more of the thread and check out these links.

Overclocking links

John Carcich's site
<A HREF="http://www.beachlink.com/candjac/" target="_new">http://www.beachlink.com/candjac/&lt;/A> (very technical)

Wes Newell's site
<A HREF="http://mysite.verizon.net/res0exft/" target="_new">http://mysite.verizon.net/res0exft/&lt;/A>

John Carcich's Workarounds link (explains many of the issues, again very technical)
<A HREF="http://www.beachlink.com/candjac/Workarounds.htm" target="_new">http://www.beachlink.com/candjac/Workarounds.htm&lt;/A>

KR7A thread
<A HREF="http://www.amdforums.com/showthread.php?s=b133715bc39bc... xp2400&pagenumber=1" target="_new">http://www.amdforums.com/showthread.php?s=b133715bc39bc... xp2400&pagenumber=1</A>


<b>56K, slow and steady does not win the race on internet!</b><P ID="edit"><FONT SIZE=-1><EM>Edited by phsstpok on 10/04/03 07:23 PM.</EM></FONT></P>
October 4, 2003 11:33:15 PM

I thought is was because the motherboards or the bios didn't support the higher multiplyers. Although a good overclocking board wouldn't know the difference between an overclocked 1900+ from a 2400+ would it?
October 5, 2003 12:11:53 AM

The old motherboards can't reset the 8X multiplier bit. That is, they can't manipulate it so you only have limited multiplier control from BIOS. However, if the 8X multiplier is set on the CPU or forced by a mod on the motherboard the BIOS can still manipulate the 4 other multiplier bits. This allows control of the high range of multipliers or the low range of multipliers depending on the setting of 8X bit.

Multiplier remaps make the process a bit complicated but basically it is workable on all socket A motherboards (with a few exceptions).

An overclocked XP1900+ would look the same as XP2400+ at the same speeds as far as the BIOS is concerned.

Here's the remap table for legacy motherboards (8x bit must be enabled).

<pre>Bios Remap
5x ----> 13x (doesn't work on some mobos)
5.5 ----> 13.5x (same)
6 ----> 14x (same)
6.5 ----> 21x (same)
7 ----> 15x
7.5 ----> 22.5x
8 ----> 16x
8.5 ----> 16.5x
9 ----> 17x
9.5 ----> 18x
10 ----> 23x
10.5 ----> 24x
11 ----> (reserved)
11.5 ----> 19x
12 ----> (reserved)
12.5 ----> 20x</pre><p>
<b>56K, slow and steady does not win the race on internet!</b>
October 5, 2003 7:45:40 AM

Seems like your question is candid enough.

When a mobo (motherboard) manufacturer releases a new mobo it's normally tagged as version "1.0" albeit it has bugs. The BIOS update that you download from the site is to take care of that bug.

I've flashed BIOS in several mobos ie; Gigabyte, DFI, Asus,
ECS etc. My last BIOS flash was the ECS K7S5A. This board doesn't even have a version number. When ECS originally released this board, the BIOS would recognize up to Athlon XP 2100+ @133 but with the update, it'll recognize up to 2600+ @133 w/.13 micron. The bottleneck in this case is the chipset. I'm locked at 266 DDR. I could of course invest in a new mobo.

The VIA KT266 chipset will support like I said all AMD Processors running the 133MHz FSB.

When you install a new or different processor, the BIOS will reset into its default settings so it can boot. What you'll have to do is go into the BIOS and set the appropriate multiplier and voltage for the CPU you installed.

In this case with the Abit board it can deal with up to 2100+ because Abit discontinued support.

As far as learning this stuff you'll have to read and read and read and READ!!! :lol: 



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October 5, 2003 7:46:45 AM

Too bad. Seems like a good motherboard.

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