I'm looking for a cyrix 6x86mx pr 233 found one on ebay tested for 30 dollars is that an ok price?

Just wanted to show my Cyrix appreciation - a link to my other build thread here: Artex's Build of the Week: Cyrix 5x86-120GP + MB-8433UUD + SB16 & Roland DB + GUS = Joy

Nahkri wrote:

I'm looking for a cyrix 6x86mx pr 233 found one on ebay tested for 30 dollars is that an ok price?

It would depend on what part of the world you are from. Prices are higher in some places than in others.

Nahkri wrote:

I'm looking for a cyrix 6x86mx pr 233 found one on ebay tested for 30 dollars is that an ok price?

As posted above - it depends from your location.
Plus the only Cyrix 6x86MX-PR233 I seen was 2.5x75 MHz. But there is some info about the others 2 models - 3x66.7 MHz and 2x83.3 MHz. Maybe the seller sells something like this... I was wrong, these two were IBM only.

Nahkri wrote:

I'm looking for a cyrix 6x86mx pr 233 found one on ebay tested for 30 dollars is that an ok price?

I wouldn't pay that much for such a common processor. Is there any reason you are after this particular marking on the CPU? I think any MX PR233 or better, like the MII, can run at 200 MHz.

feipoa wrote:

I wouldn't pay that much for such a common processor. Is there any reason you are after this particular marking on the CPU? I think any MX PR233 or better, like the MII, can run at 200 MHz.

Ok so it's a bit expensive even if transport is free ? problem is i can't find any kind of 6x86mx or M2 locally.
I'm looking for this particular model, since i wan't to recreate an old pc for a friend,he had this model of proc back in 98.

Nahkri wrote:

feipoa wrote:

I wouldn't pay that much for such a common processor. Is there any reason you are after this particular marking on the CPU? I think any MX PR233 or better, like the MII, can run at 200 MHz.

Ok so it's a bit expensive even if transport is free ? problem is i can't find any kind of 6x86mx or M2 locally.
I'm looking for this particular model, since i wan't to recreate an old pc for a friend,he had this model of proc back in 98.

A little bit, but it depends if you really care or not. You basically pay that to go out to see a movie now anyway, so if you'll get a few hours of fun out of it then it is probably worth it for you.

I wouldn't pay that much, but I have one already and also it doesn't have the same sentimental value as it does to you.

I originally wrote this in response to a post in another thread, but realized the post is more appropriate here instead.
re: why Cyrix would have been appealing at that time:

AMD was practically dead with their fastest K5 running at about 90MHz. I thought they were going to go out of business, in any case they were irrelevant.
Intel's fastest desktop Pentium was either the 166 or 200MHz, and they were expensive.
Cyrix had the 6x86 "P166+" and "P200+" for lower prices, and they had great performance in the integer based apps of the time. They also gave me some confidence by posting a list of recommended motherboards on their web site - our previous home-built PC had been a disaster of instability, so much that I was unsure of the wisdom of home building a PC. The Cyrix build worked out great, it was a solid machine, and finally allowed me to play games that I had never been able to reliably enjoy on our crash-prone 486.
At the time we got ours, Cyrix was pretty much at their competitive peak. The FPU weakness didn't come to light until 3D became a big thing, with Quake in my case. It had run DOOM very well, but DOOM is integer based.
Even after I decided to upgrade, I gave serious thought to just getting a faster clocked Cyrix M2 chip for the old board. I'm not sure if that would have been a good idea. Dangit, that's another build I should try sometime. I still have that old motherboard, and some faster Cyrix and Pentium MMX chips to compare.

After it was retired from gaming, that Cyrix machine became my first UNIX system, running an old version of FreeBSD. My introduction to UNIX in college was pretty rough, I needed the help. 😀

I bought a 6x86MX PR23 (3.0 x 66MHz model) as an upgrade for a K5 PR133. Unfortunately it didn't work on my mainboard (or at least only at 133MHz, probably because of missing split voltage support - I just didn't have enough knowledge at the time) so I had to upgrade my mainboard too.
Even at 133MHz it was a lot faster in some tasks/games than the K5, but not in Quake, even at 200MHz I was disappointed there. I had read that Cyrix had improved FPU performance in the M2 over the M1, but that must have been insignificant. I was much happier with the K6-2 I upgraded to after a short while. Fortunately both CPUs were quite cheap.

By the way, was there a standard (2.9 V) version of this Cyrix?

Gamecollector wrote:

By the way, was there a standard (2.9 V) version of this Cyrix?

You mean 66mhz x 4.0?

sliderider wrote:

You mean 66mhz x 4.0?

Yes.

Well this arrived, it's a 386-to-486 Cyrix upgrade complete in the box.

I'll transcribe the manuals and extract the files off the floppies if anyone needs them. Because I (presume) these don't remain complete in the box I'll keep the contents and won't discard them.

"Higher performance without buying a new computer!", classic.

Nice! What system do you plan on putting this into? I hope that red dot does not mean it failed QC.

could you make a pdf scan of the manual available if and when you have time?

Could have been that it failed at 66MHz, but it works perfectly fine at 50.

Anonymous Coward wrote:

could you make a pdf scan of the manual available if and when you have time?

Could have been that it failed at 66MHz, but it works perfectly fine at 50.

It must be as the CPU works fine, and yes I'll scan the manual when I have a chance and send you a PM.

This is primarily meant to temporarily troubleshoot a 386 system, but it could become the primary CPU of the machine.

Could you post the PDF of the manual to the forum? I also have a DRx2

I'm looking at the instructions on the back of that box for upgrading SX processors...
Did they include some sort of gizmo that lets you just snap the CPU on top of the pins of a soldered SX chip? Because it seems like that's what they're implying.

shamino wrote:

I'm looking at the instructions on the back of that box for upgrading SX processors...
Did they include some sort of gizmo that lets you just snap the CPU on top of the pins of a soldered SX chip? Because it seems like that's what they're implying.

The 386 DX and SX use completely different motherboard designs. The sticker on the front of the box says this one is for DX systems. You need a socketed DX motherboard to use it. Snap on upgrades for 386SX systems are very difficult to locate these days. There was a seller on ebay who had a some a long time ago, but he's been sold out for a really long time now and hasn't been able to get any more to my knowledge.

I have the 486SRx2 manual scanned if anyone needs a copy.