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Mithloraite
Joined: 18 Nov 2014
Posts: 4
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joekster
Joined: 12 May 2011
Posts: 100
Location: Palm Beach, Florida USA
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 Posted: Tue Nov 18, 2014 11:45 pm Post subject: |
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I have a similar setup. It's an evergreen sxl2-50 smt chip on a carrier/vrm board. The kit includes a small heatsink that glues on top. at 50mhz it doesn't need any heatsink. BUT, my chip overclocks to 80mhz (limit of my mobo) 100% for hours on end.
My board's bios can configure the cache and such, but not the 2x multiplier - have to use the utility for that. Wish my board had an updated bios...
I do have 1 more chip/kit left. It's new in sealed bag. Was saving it for a rainy day, but if you make an offer I can't refuse... |
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diodenmann
Joined: 07 Apr 2008
Posts: 69
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| Posted: Wed Nov 19, 2014 11:43 am Post subject: |
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| I have one of those Panda386V boards and a TI 486SXL-40. You can run this CPU also in clock doubled mode (2x20 or maybe 2x25 MHz) via utility/autoexec.bat entry. Bios offers no option for setting the multiplier. Perhaps there is a chance that this 66 MHz chip mentioned has some kind of "hard-wired" clock-doubling feature? |
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black_monolith
Joined: 18 Mar 2007
Posts: 248
Location: Shandong, China
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| Posted: Thu Nov 20, 2014 5:12 pm Post subject: |
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| I have been looking for one of these too, but not sure that I'd pay through the nose for a 50MHz version. It's cool to know it works at 80MHz though. The DRx2-33/66 certainly doesn't. |
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Mithloraite
Joined: 18 Nov 2014
Posts: 4
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| Posted: Fri Nov 21, 2014 11:02 pm Post subject: |
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| black_monolith wrote: | | I have been looking for one of these too, but not sure that I'd pay through the nose for a 50MHz version. It's cool to know it works at 80MHz though. The DRx2-33/66 certainly doesn't. |
Cyrix parts tend to be poor overclockers. And it (DRx2) feeds off 5 volts. That would be hot, and the technology's likely at it's limits.
What I doubt is that "all" TI25/50 parts overclock so well.
Not just any 5x86 133Mhz AMD can be perfectly stable at 160 Mhz... Even if they are known good overclockers. |
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Mithloraite
Joined: 18 Nov 2014
Posts: 4
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| Posted: Fri Nov 21, 2014 11:18 pm Post subject: |
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| joekster wrote: | I have a similar setup. It's an evergreen sxl2-50 smt chip on a carrier/vrm board. The kit includes a small heatsink that glues on top. at 50mhz it doesn't need any heatsink. BUT, my chip overclocks to 80mhz (limit of my mobo) 100% for hours on end.
My board's bios can configure the cache and such, but not the 2x multiplier - have to use the utility for that. Wish my board had an updated bios...
I do have 1 more chip/kit left. It's new in sealed bag. Was saving it for a rainy day, but if you make an offer I can't refuse... |
Thank you for the offer. A 132-pin part with a vrm base? That would be good.
Though I mainly thought of a 66Mhz variation to avoid any overclocking.
It's amazing news a 50Mhz part can overclock so well using just a small heatsink. Though low voltage should be of great help to do it.
The good question is are they all so great at overclocking. All do 80Mhz or at least 66Mhz?
Maybe I should go for a tested sample and not the sealed one. Is that an option?
As regards the price I'll have to dig eBay for the present and (importantly) completed listings of 50- and 66Mhz clockdoublers.
This should give me some insight. I really don't buy such things every day  |
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Mithloraite
Joined: 18 Nov 2014
Posts: 4
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| Posted: Fri Nov 21, 2014 11:31 pm Post subject: |
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| diodenmann wrote: | | I have one of those Panda386V boards and a TI 486SXL-40. You can run this CPU also in clock doubled mode (2x20 or maybe 2x25 MHz) via utility/autoexec.bat entry. Bios offers no option for setting the multiplier. Perhaps there is a chance that this 66 MHz chip mentioned has some kind of "hard-wired" clock-doubling feature? |
Thanks, I think that would be an interesting experiment. Though 25Mhz bus brings little performance. So it would be just a test for 40Mhz SXL abilities. 50Mhz capable or not.
I would never hope the multiplier is set though the bios. Ruling the CPU settings from the bios is a later developement AFAIR. More likely it's in the jumper settings.
Pity I have never seen a 'real' manual (scans) for the Panda board, only the stason.org brief description.
http://stason.org/TULARC/pc/motherboards/U/UNIDENTIFIED-486-PANDA386V.html
To me it looks that the multiplier is set with the jumpers. Don't you think so? |
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