Where to get 50ns 72-pin SIMMs?

[Bamiga2002]

Hello. Looking for two 64MB or 128MB 50ns SIMMs (one-sided or flat 2-sided to fit a BPPC). Where to find those with a fair price? I've found a Kingston-model but they cost a fortune! :angry:

[Bamiga2002]

First of all, thanks for the replys . Now should i get non-parity or parity simms? FPM or EDO? What's the difference?

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

[Bamiga2002]

@AmigaMance:
I did read your post. I think 50ns is faster than 60ns, don't you?

[Bamiga2002]

Thanks very much for the pics, these should fit a BPPC just fine .

[Bamiga2002]

Bumping this topic here . I did some testing with different oscillators on my BPPC (normally 68060:50Mhz/PPC:60Mhz*4=240Mhz):

68060:66Mhz - tried to boot up and managed to load BlizKick, but at next boot stayed in an infinite boot loop for awhile, after which refused to boot at all. 3-finger salute doesn't help.

68060:60Mhz - seems to work steady with this speed. boots up and works fine.

PPC:66Mhz*4=264Mhz - PPC programs start but many times come the powerpc exceptions and the miggy hangs (mouse won't work). Not a good setting to use.

PPC:64Mhz*4=256Mhz - PPC programs start and...seem to work just fine! I'm using this now and looks good this far.


I thouht why some people seem to be able to clock their boards safely @66Mhz, still in my setup things crash and do not work if i set either the 68060 or PPC to 66Mhz bus speed. I didn't test the 68060 with 64Mhz (too lazy). But i think the overall stability comes from the 68060 and it's stability, so i won't up it's speed any further from 60Mhz (it's fast enough with that anyway :-)).

BUT, i also think the RAM quality/speed is to blame for not being able to run either the 68060 or PPC at 66Mhz. Next i'm going to hunt down some quality SIMMs that can cope with higher oscillator speeds. And YES, i have taken care of proper cooling on both 68060 and PPC :-).

Any experiences or solutions you lot might have as for what memory should work properly here?

[Bamiga2002]

WhichAmiga says:
MC68060 (rev 5)
PPC (rev 2.1) - it finds my 64Mhz oscillator at 63Mhz though :-)
My BPPC board is version 0.

[Bamiga2002]

@Oli_hd
Checked closer the 68060 revision, it's 01G65E.

@alexh
Yep, what's the use of WAIT_STATES if they slow things down .

@stopthegop
Is there a reason for you using the CPU060 command (are you?), because you can set the RAM speeds in the BPPC-bootmenu?


I'm wondering what should be the middle route in options considering speed performance between overclocking and using RAM waitstates & preloads? If i overclock, in some point i have to slow down the RAM, so what's the use then? Btw. i have only activated PPC-precharges in the BPPC-bootmenu.

[Bamiga2002]

@alexh
Maybe i'll test some more with the oscillators, fiddling with the waitstates etc. :-)

[Bamiga2002]

Bumping this thread here! :-)

I just ordered 2 pieces of 128mb SIMM-modules from Aememory, they are 60ns but no-go searching for 50ns 128mb ones. But i need the memory. And maybe i'll give up the overclocking if the memory can't cope...

I have to test and see :-P

Cheers!