|
486 Interposers and Upgrades
Type 3 5x86 @ 150 MHz vs Type 4 P60 Benchmarks (by Jim Shorney)
AMD 5x86-P75 with an Interposer
Evergreen 586
Intel DX4-100 Upgrade
OS Issues
AMD 5x86-P75 with an Interposer
From Jim Shorney:
Well, this is another one of those subjects that has been
discussed to death here, but here's the scoop: I replaced the 486DX-50
with an AMD 5x86-P75ADW (some folks say you need the ADZ because of the higher
thermal rating, but I had no troubles withe the ADW).
I used a PowerLeap interposer to get the voltage right, with a standard
fan/heatsink, and set the CPU to x3 mode to get 150 MHz. It happily ran OS/2
Warp 4.0 and NT Workstation 4.0 for many months (until last night when I
installed the type 4), and was rock stable. Not bad for a cheap, screwy CPU...
:)
Evergreen 586
Successful upgrade by Bradley Parker
CPU:
Evergreen Technologies, Inc
Model G 1 REV 1 MADE IN USA
AMD Am5x86 P75 (soldered QFP package)
(no other model numbers on chip, lot #1375)
Jumper Settings (x=closed)
| Status |
Label |
Function |
|
WB |
Write-Back Cache |
| X |
WT |
Write-Through Cache |
|
| X |
3X |
3X Clock Multiplier |
|
4X |
4X Clock Multiplier |
|
|
OvrDrv |
Overdrive Socket |
| X |
Nrml |
Normal CPU Socket |
Write-back causes weird behavior. 4x won't run.
More info about the Evergreen upgrade HERE.
Intel DX4-100 Upgrade (written by MadMax)
This is probably the thickest processor complex I've ever seen. Peter
started with a Type-3 "double-decker" board to create this high-performance
monstrosity running at 100 MHz. It also uses a Reply interposer to feed the
proper voltage and clocking to an Intel DX4-100 processor. This lucky complex
inherited the *other* half of the Pentium-II heatsink...
Happiness is accepting that you have a fat complex...
Top view of the beast
Note that the bottom edge of the Reply interposer extends below the
processor card itself! Peter says that thanks to the very high processor slot
connector the card "just fits", although it partially rests on a crystal on the
planar. Peter solved the dilemma by isolating the contact point with a piece of
silicon tape. :-)
With the DX4 set to 2x clocking (the Reply interposer has a jumper for 2x
and 3x clocking) for 100 MHz performance, the platform registers 44 BogoMips in
Linux. Very impressive.
OS Issues
Unable to install Win98 because the processor is not at least 66 MHz. NT4.0
fails on install also (unable to find files needed for networking).
From Jim Shorney:
Use "setup /nm" for W98. You may have SCSI problems w/98. I was
never able to get it to run w/o DOS mode using the Evergreen. Put the stock
50 MHz back in and it was fine, so I am currently running NT4.0 SP5
on mine. No problems with NT.
> I got it to run just fine with the Type 3 DX-50. Never understood why
others had so many problems with it.
From Peter:
That Type 3 DX50 (-xMx models) is the only exception I found
so far. All my other machines (Mod. 90 / T2 DX2-25/50, 8595-AKD /T1 DX-33,
9577-1NA / DX2-33/66) fell flat on the face and into 16-bit mode. Only
the "Lacuna" with the Fast SCSI-2 Future-Domain derived controller and
the 9595-AMT with T3 DX50 worked.
> Is this upgrade possible with the Kingston Turbo Chip but not the
Evergreen?
From Jim Shorney:
Known to work better with the Evergreen. Cache policy problems
with the Kingston. Can't see more than 32 MB, floppy no workie etc...
Same problems with write back cache on the Evergreen. Evergreen has
the jumper which fixes those.
|