I don’t understand why you’d want to remove the heatsink? The good thermal adhesives are pretty much permanent. Personally, I’d find a heatsink that you could screw a 40mm fan into and use thermal epoxy to permantly attach it to the CPU. That way you can replace the fan with any generic one down the road without removing the heatsink itself.

That’s assuming you want/need a fan. If you don’t, it’s even less of a reason to remove the heatsink.

DRx2-33/66 is a rare CPU. If you epoxy a heatsink onto it, you are destroying much of its value as a collectible. Not to mention, you're making it almost impossible for the next owner to determine what the chip actually is, since the bottom markings don't clearly indicate the model or speed.
The adhesive pads that Cyrix used are easy to remove and don't cause any damage to the lettering when taken off. It would be nice to determine which product they were using, so we could possibly buy more of them.

I personally feel the best option for Cyrix chips without heatsink is to use a 3D printer to create a plastic bracket. The bracket sits between the CPU and the socket. Then all you would have to do is cut some aluminium heatsink and wire it onto the bracket. I have several such brackets for my 486 chips, and they work great.

timb.us wrote:

I don’t understand why you’d want to remove the heatsink?

I have three of the PGA168 SXL2 chips and the heatsink matches the QFP144 version for the most part.

timb.us wrote:

The good thermal adhesives are pretty much permanent. Personally, I’d find a heatsink that you could screw a 40mm fan into and use thermal epoxy to permantly attach it to the CPU. That way you can replace the fan with any generic one down the road without removing the heatsink itself. That’s assuming you want/need a fan. If you don’t, it’s even less of a reason to remove the heatsink.

As Anonymous Coward pointed out, you would depreciate the collection value to permanently adhere a non-original heatsink. Even an original heatsink, if it is removed or falls off and the lettering is damaged, you lesson the collection value. I agree that using permanent thermal epoxy may be OK for non-collectable chips, for chips which are common, or for chips in which you don't care if the lettering is ruined. The SXL2-66 QFP144 on PGA132 and DRx2-33/66 are rare and maintain a high resale value.

i will add new Doom benchmark data.

feiipoa seems to be interested in the performance difference of the VLB / ISA graphics card under the 486DRx2-66 CPU environment.

It was measured in environments that measured performance two years ago. ( Post your 386 Speedsys results here )

I have benchmark 3 CPUs. and

5 VGAS.

1. Tseng ET4000AX ISA 1MB
2. CL-GD5434 ISA 2MB
3. Tseng ET4000/W32P VLB 1MB
4. CL-GD5434 VLB 1MB
5. S3 Vision868 VLB 2MB

spec is

CPU1 : Cyrix 486DRx2 66MHz (L1 WT,L2 WT) (386 Socket)
CPU2 : Intel 486DX2 50MHz (L1 WT,L2 WT)
CPU3 : Intel 486DX2 66MHz (L1 WT,L2 WT)
RAM : 16MB 60ns (4MB x 4)
M/B : Aquaris MB-4D33/50 3/486 VLB Motherboard (OPTI 495SX)
I/O : Promise EIDE2300 VLB E-IDE
HDD : PQI DiskOnModule 2GB E-IDE

Speedsys data. Pic 1,2 is Cyrix 486DRx2-66MHz, Pic 3,4 is Intel 486DX2-50MHz, Pic 5,6 is Intel 486DX2-66MHz

I will attach the YouTube URL of the result of this benchmark.

Intel 486DX2 50MHz + Tseng ET4000AX ISA 1MB - https://youtu.be/737Mqce7SqY
Intel 486DX2 50MHz + CL-GD5434 ISA 2MB - https://youtu.be/vYSL-6qghJ0
Intel 486DX2 50MHz + Tseng ET4000/W32P VLB 1MB - https://youtu.be/ViWFH8tx6Eo
Intel 486DX2 50MHz + CL-GD5434 VLB 1MB - https://youtu.be/YiFAL1fRqC4
Intel 486DX2 50MHz + S3 Vision868 VLB 2MB - https://youtu.be/-DVG12ot6gU
Intel 486DX2 66MHz + Tseng ET4000AX ISA 1MB - https://youtu.be/cs_TTCNz_-8
Intel 486DX2 66MHz + CL-GD5434 ISA 2MB - https://youtu.be/GZt_BxCAKqE
Intel 486DX2 66MHz + Tseng ET4000/W32P VLB 1MB - https://youtu.be/R7cm5CFFbvk
Intel 486DX2 66MHz + CL-GD5434 VLB 1MB - https://youtu.be/shHNU9MHLHo
Intel 486DX2 66MHz + S3 Vision868 VLB 2MB - https://youtu.be/VHqqJ01Tyv4
Cyrix 486DRx2 66MHz + Tseng ET4000AX ISA 1MB - https://youtu.be/XqhzooIuvXg
Cyrix 486DRx2 66MHz + CL-GD5434 ISA 2MB - https://youtu.be/0kGsfmet4B8
Cyrix 486DRx2 66MHz + Tseng ET4000/W32P VLB 1MB - https://youtu.be/VSQETtEfcB0
Cyrix 486DRx2 66MHz + CL-GD5434 VLB 1MB - https://youtu.be/eiwGC4O9v08
Cyrix 486DRx2 66MHz + S3 Vision868 VLB 2MB - https://youtu.be/x2PtOx3NyWU

Doom benchmark results are always of interest - I also used to watch your youtube-videos since you seem to have so many of these "old" chips. Have you ever thought about "donating" Doom scores to Anton's http://www.complang.tuwien.ac.at/misc/doombench.html?

amadeus777999 wrote:

Doom benchmark results are always of interest - I also used to watch your youtube-videos since you seem to have so many of these "old" chips. Have you ever thought about "donating" Doom scores to Anton's http://www.complang.tuwien.ac.at/misc/doombench.html?

good idea.

I will send an email to Anton Ertl with detailed specifications.

Nice! 21.4% increase when going from the ISA to VLB version of the GD5434 on the DRx2-66, or 11.3% increase on the AMD 386DX-40.

skv400 wrote:

amadeus777999 wrote:

Doom benchmark results are always of interest - I also used to watch your youtube-videos since you seem to have so many of these "old" chips. Have you ever thought about "donating" Doom scores to Anton's http://www.complang.tuwien.ac.at/misc/doombench.html?

good idea.

I will send an email to Anton Ertl with detailed specifications.

Great - some exotic entries are always cool!
His page is a subtle but timeless ode to Doom.

Finally, somebody published Vision868 results. Now that I see it's on par with GD5434 and ET4000W32P, I don't have to waste more time looking for one.