schur@isi.edu (Sean Schur) (08/28/90)
I am posting this for a friend, but please respond directly to me. I will give him this info. He has a 2500/030 running at 25Mhz and has heard about the faster 33MHZ and 50 Mhz accelerators available now. Is it possible to speed up his current card by maybe just replacing some of the chips or would he have to do a complete upgrade by buying one of the new GVP cards and selling his current one? ============================================================================== \ / \ \ / / Sean Schur \ \ / / \ \/ / USENET: schur@isi.edu \ /a\mpyr/ Compuserve: 70731,1102 \/ \ / ideo Plink: OSS259 \/ ==============================================================================
mwm@raven.pa.dec.com (Mike (Real Amigas have keyboard garages) Meyer) (08/29/90)
In article <14733@venera.isi.edu> schur@isi.edu (Sean Schur) writes:
He has a 2500/030 running at 25Mhz and has heard about the faster 33MHZ and
50 Mhz accelerators available now. Is it possible to speed up his current
card by maybe just replacing some of the chips or would he have to do a
complete upgrade by buying one of the new GVP cards and selling his current
one?
GVP has an upgrade offer on to take _any_ accellerator card in trade
for a GVP 3001, so your friend doesn't _have_ to sell his. If he's got
a GVP card, he ought to be able to send it to GVP to upgrade to the higher
clock speed for the price differrence between the boards. At least, that's
what the promised me when I was looking into accelerators.
<mike
--
The Sword of Damocles is hanging over my head Mike Meyer
And I've got a feeling someone's gonna be cuttin' the thread decwrl!mwm
Oh -- woe is me, My life is a misery mwm@relay.pa.dec.com
And all I can see is I'm on the start of a pretty big downerdanb20@pro-graphics.cts.com (Dan Bachmann) (09/07/90)
In-Reply-To: message from schur@isi.edu
In the September 1990 of Amazing Amiga Computing magazine it
explains that you can increase your 25MHz Commodore 68030 board by replacing
the 4 pin 25Mhz Crystal with a 28-29MHz crystal no problem and there should be
a noticeable speed difference of about 10%, so you'll be running a 28MHz 68030
rather than a 25MHz 68030. Gee, I'm still running a stock 68000.<LEEK@QUCDN.QueensU.CA> (09/08/90)
In article <4278@crash.cts.com>, danb20@pro-graphics.cts.com (Dan Bachmann) says: > >In-Reply-To: message from schur@isi.edu > > In the September 1990 of Amazing Amiga Computing magazine it >explains that you can increase your 25MHz Commodore 68030 board by replacing >the 4 pin 25Mhz Crystal with a 28-29MHz crystal no problem and there should be >a noticeable speed difference of about 10%, so you'll be running a 28MHz 68030 ---------------------------------------- Unless you are doing heavy duty CPU bound stuff all in FAST ram or cache, you won't get all the 10%. The 10 % is the upper limit. If the CPU have to do any chip ram access, it'll have to slow down... In general, it is hard to notice any speed increase of 10%. The max speed you'll every get is 10% or so. Whether or note you can actually feel it is another question. I personally won't notice it. You pay for that additional 10% of performance by risking reliability (timing, noise, heat etc) >rather than a 25MHz 68030. Gee, I'm still running a stock 68000. I am running a 18.4MHz 020 Lucas/Frances. I don't notice the speed gain (40% without 32-bit ram) at all. (with 32-bit ram, it runs at 4.6X speed <- that ) I can tell) K. C. Lee Elec. Eng. Grad. Student
daveh@cbmvax.commodore.com (Dave Haynie) (09/11/90)
In article <4278@crash.cts.com> danb20@pro-graphics.cts.com (Dan Bachmann) writes: >In-Reply-To: message from schur@isi.edu > In the September 1990 of Amazing Amiga Computing magazine it >explains that you can increase your 25MHz Commodore 68030 board by replacing >the 4 pin 25Mhz Crystal with a 28-29MHz crystal no problem They're counting on a considerable amount of luck here. Most designs, the A2630 included, have a bit of design margin; they're at the least designed to work at worst case, where the temperature is a hot as it gets and all chips are as slow as they get. So it stands to reason that, when you're not going at worst case, you might go faster. Not every IC is going to be at its slowest possible timing, and you're rarely running at the full 40C ambient temperature. Going to a faster clock speed will most likely produce a number of machines that just plain fail at room temperature, the majority which will probably fail when they get too warm, and a couple which will work 100% throughout the temperature range. It's not even quite as nice as that, though. The 68030, for instance, is only rated at 25MHz. When you feed it a faster clock, it can start behaving out of spec, which can further stress the speed of the system. This clock mod is a do-at-your-own-risk kind of thing, of course, but even still, I wouldn't recommend it. I may eventually come out with a safer A2630 speedup modification, since so many folks keep asking about it. But such a speedup, done correctly, will cost much more. -- Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy Get that coffee outta my face, put a Margarita in its place!