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Hey guys. I'm trying to sell some oldschool CPU on ebay but the front is attatched to a heatsink with some strongish sealant that i cant get off, so looking at the back its 168-pin - And by the size of the gold square it looks as if its AMD5x86 not Intel 486 (because the square is slightly smaller and intels tend to have a code printed on the gold squares)

 

however when i look at the AMD5x86 - they all have a gold line in one corner of the square - whereas this one dosent. anyone have any suggestions what type/model it might be? Dont think its Cyrix or IBM

 

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Posted

Looks like it's possibly an AMD 486 DX to me.  Unsure whether it's a DX-40, DX2-66, DX4-100 or DX4-120 though.  Either way I'm pretty sure it'll be worth next to nothing.

 

Then again, these old CPUs do seem to sell for a reasonable amount considering.  Likely due to scrap gold recovery.

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Posted

Is that one of the old Cyrix Processors?

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Posted

Should be this one, but as You said it is missing the gold line. However they both have one square pin at the same place perhaps from manufacturing process

 

AMD-X5-133ADW.jpg

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Posted

I do have an old Cyrix processor and it has something printed in the middle of the pins side. It's an old Cx486DLC and it's printed "1992CyrixUSA" . So I doubt that's a Cyrix.

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Posted

Except the Intel chip has the printing on the gold square, the one in the first post doesn't.  And AMD's 486 chips match the ones in the first post exactly.  I'm still sticking with it being an AMD 486 of some sort.

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Posted

Thanks so much for the suggestions guys. and yes they have gone up slightly in value. some can sell for potentially 10-30 pounds so i'd love to know what model it is as i can't get the heatsink off!

 

And yes im not sure if its an intel, as i said they all have the printing on the gold squares! - where as mine dosent. nore does it have the gold line in the edge of the gold square - however im still more inclined to say its an amd5x86

 

Can we get a definite suggestion?! kind regards!

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Posted

Well if you look at the link in my post above you'll see the AMD 486 variants match it exactly.  However it's impossible to identify exactly which CPU it is from the bottom.  The only way you'll know for definite is by getting the heatsink off or by putting it in an old Socket 3 motherboard and firing it up.

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Posted

i think it's one of the 3 i listed in all honestly but beyond that sadly they look 99.9% if not 100% the same as far as i can see. 

My advice? Use dental floss and keep working away it should shift it if it's not ridiculously stuck and then attempt to remove it with a twisting motion. Failing that a safe way to heat it gently. No metal objects to 'pry' it as this risks damaging it or snapping/bending a pin. 

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Posted

Soak the CPU pins up in some high alcohol containing solution (70-90%) like isopropyl alcohol for several hours. Leave it soaking for a night. The heatsink should come off easily the next morning.

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Posted

If i soak it in alcohol/purell gel (isopropyl) overnight do you think it would still work without damaging it? Im not planning on running it or plugging it in anytime soon

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Posted

It's a Intel 486 DX it looks like something that shipped with a PCChips style motherboard, which came as a combo kit of MB/CPU already together. That's why where are no markings on the bottom silicon cover. Can you give an exact pin count, did you actually count them out to verify?

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Posted

its not a amd 586 x5 mine never looked like that at all 

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Posted

Pretty sure it's not a DX4-100, I'm almost positive the DX4-100mhz needed aircooling or else it would fry it's self. And the only DX4-100mhz that came out without air cooling is the Overdrive model, which had a black heat-sink and this clearly does not have.

 

It is actually Intel 486DX4-100 SK051. So ignore my post about it being AMD.

 

 

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Posted

dont go off the heatsink though, that was randomly put on with the sealant!

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Posted

dont go off the heatsink though, that was randomly put on with the sealant!

 

Like epoxy or something? that doesn't conduct heat from the ceramic to the metal very well.... if they did that, they should have just super-glued a ham and cheese sandwich to it.. you'd get the same cooling capabilities...

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Posted

noo. that first ebay link was mine haha - so dont go off that either! Also if you look at the last ebay link the gold square is slightly bigger.

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Posted

I'm curious where did you get the processor? Are you sure it's not just some custom designed circuit or some old obscure microprocessor (I mean not x86 -- something really oddball)? Packages like that aren't uncommon as far as I know. For example, here's something I custom fabbed a number of years ago. It's not exactly the same but it looks similar:

https://www.dropbox.com/sh/6zgtcmxyjc87g81/jk3O55ubqI

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