Where to get 50ns 72-pin SIMMs?

[Oli_hd]

Hello. Looking for two 64MB or 128MB 50ns SIMMs (one-sided or flat 2-sided to fit a BPPC).

A month ago I bought a load of simms (pimping out my A2632) and at the same time stuck a 128meg 72 pin simm in, when it turned up its a single sided 50ns gold plate beauty.
The down side is it was advertised as 60ns standard but it may be worth e-mailing the company to see.
I got them from aememory
Best of all it was only £13.99, free postage.
The 32 meg simms were good too. (60ns though)

I had a 50ns 64meg simm for a while, ended up giving it to a guy at LAG.

Anyhow when I get home I will sort the simm out and take a pic so you can see what its like.

[Oli_hd]

@Oli_hd:  Was the 128mb memory you referred to AE15-128EDO?

Hi, Yep thats the one.
Sorry I havent got around to taking a photo yet, I did sort the Simm out though and double checked, its double sided but its using the thinest chips (TSSOP like) which are only about 1.5mm tall tops.

On a side note I was going through my simm drawer and found most of my old old old 30pin simms are 60ns and I even have a small 72pin simm with -50 marked..

[Oli_hd]

Hmm sorry for the delay in posting these pics.. things have kinda got in the way a bit.

Ok, get ready for a photo explosion


The whole simm (Earthquake, honest.)

Ram chip (one of eight) showing the -5 speed grade

Pic of how thin the simm is.

Now I havent actually got anything to test the 50ns speed rating.. it could be that the chips are mislabled but still, cheap cheap cheap

edit---
Hmm Ive just stuck a multimeter on the Simm to check what its set up as (60ns or 50) and its been set to 60ns so I guess they are either using chips that failed the 50ns testing or they got to many returns from computers that didnt understand the 50ns timing. :-/
(another strange thing is the simm is set at 2/32meg... (pin 68 is ground and 67 is nc)

[Oli_hd]

How "tall" are the modules?

31mm from top to bottom, about 22mm above the centre of the locking hole (the hole drilled in the simm)

but that is not the same thing as saying that the whole module can operate that fast. It does, however, mean that it will not be the chips that are the restriction.

The simm is made up from 16 chips, all rated at 50ns, there are no other components on the board (apart from surface mounted capacitors) but yeah, it could still be a 60ns simm

[Oli_hd]

Good memory is always the key to overclocking, make sure your simms are 50ns, even if the chips say 50ns check the ident pins to see if they are telling the computer they are 50 or 60ns!

Other than that, what revision of 060 are you running? The current one is the fastest. (with the 71E41J mask)

Thats basically it for overclocking except stability is helped by upgrading the cooling/monitoring the temperatures.