Overclocking GVP Combo 040

[psodas]

Lol, I was taking the p|ss Andy!

psodas just got his wires crossed, so I thought I'd take the opportunity to do a little hand slapping.

---------- Post added at 20:17 ---------- Previous post was at 20:16 ----------

Actually, I mentioned 20mhx then later I mentioned 10 mhz - typo, corrected now.

As everyone finally realized my post based on Your previews wrong frequency -10Mhz- post!! My wires are perfectly straight!!!
Second I insist cause the 040 combo has the cpu direct soldered to pcb. Maybe your is a exception, or someone before you has made ​​some experiments.

 

[abraXXious]

Ah yes, but my FIRST post shows I had purchased a 20 mhz crystal, so I guess you should have assumed my second post was a typo.

As for the cpu being soldered to the mb, the two boards I have seen BOTH had the cpus socketted, and it is like this from factory. Perhaps the one you saw with the cpu soldered to the board was a cost reduced model or someone had experimented with it?

Lol, I was taking the p|ss Andy!

psodas just got his wires crossed, so I thought I'd take the opportunity to do a little hand slapping.

---------- Post added at 20:17 ---------- Previous post was at 20:16 ----------

Actually, I mentioned 20mhx then later I mentioned 10 mhz - typo, corrected now.

As everyone finally realized my post based on Your previews wrong frequency -10Mhz- post!! My wires are perfectly straight!!!
Second I insist cause the 040 combo has the cpu direct soldered to pcb. Maybe your is a exception, or someone before you has made ​​some experiments.

 

[psodas]

Can You post some photo from your 2 cards please? If is possible with high resolution!

Perhaps the one you saw with the cpu soldered to the board was a cost reduced model or someone had experimented with it?

I believe cause you understand very clearly, cause nobody did it so hard to extract the 040 cpu, and after solder an other without a socket first!

 

[psodas]

@AbraXX
Some pictures from your -factory socket- card top bottom is possible?

 

[matt020]

Any luck with the pics dude?

 

[abraXXious]

Will take some shortly and upload them - had to take the cpu off when I installed the 40mhz unit - should have take na closeup of the socket then.

I have an update! Installed a 20 mhz crystal and the system boots.... but crashes shortly after!

Weird, there is a 40 mhz version of this card and it looks identical... I wonder what part is failing at 40 mhz?

I wonder if a jumper needs to be changed? Any ideas would be welcome.

In any event, I have ordered a 19mhz crystal, which will of course give me a 38 mhz 040, and I think will work.

With the 20 mhz crystal the system boots to WB, loads the icons but crashes as it attempts to display the backdrop image.

Must either be a timing problem at this speed, or the Ram cannot keep up...

 

[SpeedGeek]

Probably the fast ram cannot keep up. You could try removing the fast ram and see what happens. You could also try disabling burst and see what happens. You could try setting the "reserved" jumpers one at a time and see what happens. It comes down to guess work or trial and error without technical documentation from GVP.

 

[psodas]

Hi AbraXX! Some luck with the new crystall at 19Mhz?
I also buy a new 68040@40Mhz MC series E42K revision, and a socket for that. I am waiting its arrival, first for all of its improvements -errata correction and lower heat extraction-, and after for the plus Mhz. I also order a heatsink 45x45x15mm with its TALON clip from RS Components. This clip is a must for pcbs who dont have holes to place the heatsink.

http://uk.rs-online.com/web/search/searchBrowseAction.html?method=searchProducts&searchTerm=4896170

Also photos of my work in GVP 040 combo pcb, is above.

https://www.amibay.com/showthread.php?t=16840

Ahhhh, and for last! What happen with photos of your GVP combo? Dont need to extract the cpu from its socket, only some pics from the botom solder side it Ok.

 

[rkauer]

The E42K revision is not that much cooler than the original XC versions, mate.

Only the last revision (L88M) is almost "cool" as a XC68060 from first revision.

But it indeed runs cooler than the XC 040 versions, but not much. You still have to use heatsink & fan.

 

[Slayer]

Hmmm

I think I have 2 of these combo boards myself, one at 33 and one at 40 but its been so long since I've turned either on LOL

interesting nonetheless

 

[psodas]

@Slayer
Some photos of 40 Mhz version please?

 

[joekster]

I'm having similar results. Everything *seems* stable at 38mhz(19mhz crystal), but will crash at 40mhz. I can get 40mhz to work if I disable burst mode - but 38mhz with burst is faster. I think that if the card has jumper settings for 40mhz, all should be good - but I have been unable to get these. Playing with jumpers hasn't revealed anything to me...

 

[psodas]

Hi joekster!
Do you speak about the same 040 combo card? Can you tell us about the revision of card and what cpu have you? Also have you change the cpu with an other, or overclocking the stock?
Without burst mode are you sure cause it work stable?

 

[joekster]

Not sure about the board rev, but I suspect that mine is the last rev since it came with the latest scsi rom - 4.19. My cpu is soldered. It is an xc 33mhz. It is the same mask as the 40 mhz chip that I had, so I guess it should be able to hit 40mhz - mask e41??? The chip does have a heatsink and fan; runs nice and cool. I am sure about it working at 40mhz without burst.

 

[rkauer]

Latest 040 revision is L88M, E41J is the last 060 in production.