AMD K6-2 350 vs. K6-2 400

[_Nauht_]

I have an old Asus VX97 mobo which I've just found out could be upgraded to a K6-2/3 400mhz, much like the similar thing with an older Asus mobo. I'm thinking about getting a K6-2 350 because of its price/availability but since it isn't the CPU with CXT (whatever that is), I'm worried that the 350 won't be able to see a multiplier of 2x as 6x as oppose to the 400 which could see 2x as 6x. Anybody clarify this with me?

 

[pdo]

I have a K6-2 350Mhz with a CXT core. I'm able to overclock it to 4x105=420Mhz max.

 

[_Nauht_]

Do you know which ones don't have that CXT core?

 

[gtd2000]

My friend bought a used K6-2 300 for use in his TX-97 motherboard...it overclocks to 360Mhz
It recognises the 6x multiplyer
Running the CPU at 6 x 60Mhz..
He's happy too
Hope that helps ya.

 

[_Nauht_]

Bus speed of 60mhz? Ahh.. I guess that isn't too bad, at least the difference isn't so noticable, right? I hope to get this 350 to 400(6x66) and beyond.

 

[gtd2000]

Sorry for the delayed response...my monitor burnt out - currently using a 15" - what a drag after my 17"...
The TX with the "360" runs very well indeed. It was running an Intel 233MMX previously and the improvement was significant. Obviously the 60Mhz FSB is not ideal but everything seems to be A-OK with it.
He was just too tight to get a 400Mhz CPU so we just upped the settings to get the maximum Mhz...

 

[gtd2000]

I forgot to say do you have the necessary BIOS upgrade?
I can send it to you if you can't find it..it's version 0112 or such like

 

[_Nauht_]

Wow, how did your monitor burnt out? I have the VX97, not the TX but I do have the latest BIOS Rev. 204, thanks anyways though Even with the latest BIOS, I still have to use the setk6 program to be able to use 'write allocation' or something like that since the mobo doesn't really supports it.

 

[Peter]

On K6-2, the CXT model is identified from the outside by a five-digit number on the lower left edge of the ceramic carrier. 26050 are the original K6-2, while 26351 are the CXT core ones. In software, CPUID reveals it - anything rev. 8 and up is CXT. So CPUID 0580 (family 5 model 8 rev. 0) would be an original K6-2, while a 058C would be a CXT core (rev. 12).

Everything 380 MHz and up are definitely CXT core, anything below may or may not be CXT, depending on how old they are.

Non-CXTs don't have the 2x=6x remap.

Regards, Peter

PS: "CXT" explained: K6 project codename was Chomper, the revamp then nicknamed Chomper eXTended, hence CXT. CXT basically is the K6-III "Sharptooth" core minus the L2 cache.

 

[Peter]

... and best to get for an old Intel chipset mainboard would be a K6-2/400AFR made after August 1999 (date code 9934 or later). These have substantially lower power consumption than the older ones, easing the pain for the old board's voltage regulators. (And they're CXT core anyway

Regards, Peter

 

[gtd2000]

Just one question regarding the CXT core....the CPU my friend has is only a 300Mhz version...and the 2x mult was re-mapped to 6x...perhaps the CXT core is not the only criteria?

 

[gtd2000]

Regarding the monitor...it just gave a fizzle and a flash from the side and then went into primary light colour modes then blackness.....
Took it to the shop but they said the "IC" had burnt out and could not get a replacement...it was a Trinitron tube as well but actually I didn't think it was that great.....bummer though...... ;(
Looking into a Samsung 17" or 19" depending how flush I feel...

 

[_Nauht_]

That Samsung 17" 753DF looks nice, I'm planning to get that for my new puter, hopefully later this year As for that K6-2 CPU, I guess it's the non CXT core :[ Ah well, I shouldn't worry too much about it since I'll probably get a new puter :>

 

[Peter]

gtd2000,

as I said before, CXT core K6-2 came in any speed grade all the way down to 266. It's only that anything 380 and up for sure is a CXT core, since the original K6-2 core didn't go further than 366.

Regards, Peter

 

[gtd2000]

No probs Peter..

 

[Peter]

Nauht, you can still get that non-CXT /350 and run it 366 (or 333 should it refuse to overclock) off a 66 MHz bus - as long as your mainboard has a three-jumper block for the multiplier.

Regards, Peter

 

[gtd2000]

Well I brought a K6-2 500Mhz CPU back home today.
Updated the BIOS to the 0112 version and all was OK...rebooted and checked all was still OK...no probs so far..
Took my old 233MMX out and put in the K6-2 tried to boot but nothing...powering up but no display.. ;(
Took the K6-2 out and put back the 233MMX..same thing no display..
Have tried a new display card and no go
Have the thing in pieces now ...any ideas where it all went horribly wrong?