Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-04-13, 02:43

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I really like such specialized information! However in my opinion these old CPU's are very tolerant - they should safely withstand 4V so this modification is not necessary as for me. That may be true in the short-term, but for such a rare processor, it is a much safer bet to pamper it. Plus it will …

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Re: Cyrix 5x86-133 Testing

Posted on 2011-04-13, 02:34

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@rg100 Thanks for the info. If I get stuck I'll re-read all 8 pages on the other posting. I was planning on using an ISA video card if PCI doesn't work correctly. I'd only be using the floppy to run the benchies, so IDE/SCSI is not required. I probably won't get to this for a bit as I want to …

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Re: Cyrix 5x86-133 Testing

Posted on 2011-04-12, 04:08

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@rg100 Do you happen to have a finalised step-by-step guide for how you ran the AMD-X5 ADZ or ADW at 200 Mhz for the AMI and AWARD BIOS's? If so, could you send or copy/paste it?

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Re: Cyrix 5x86-133 Testing

Posted on 2011-04-12, 03:35

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Really? Well it was a stab in the dark. How much do you think people would sell their Cyrix 5x86-133's for? K6-III+ 450 is a great chip! I ran mine in a Super7 w/AGP for sometime (FIC 503A motherboard). I think I had overclocked it to 500 or 550 without issue. I was also able to use the Cyrix MII …

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Re: Cyrix 5x86-133 Testing

Posted on 2011-04-08, 13:14

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ah good, now I can rest in peace I wonder if different versions of the Cyrix 5x86 have actual different performance per Mhz (meaning they are really different chips, instead of coming from a single product line with no changes except for scaling)? @Tetrium On the contrary -- this is where you come …

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Re: Is this a good 486 PCI board?

Posted on 2011-04-08, 12:32

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

sliderider, yes the BIOS chips are socketed. I think there is a jumper setting on the MB to set the BIOS ROM voltage for either Intel (12V) or SST (5V). JP13, 1-2 for SST, JP13, 2-3 for Intel. Unfortunately, I do not have a v2.0 board to stick my 3.0 or 3.1 BIOS into to test. I'm certainly not …

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Re: Cyrix 5x86-133 Testing

Posted on 2011-04-08, 12:23

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

rg100, are you refering to the counter-intuitive trend with VESA and System Memory bandwidths? The higher system memory bandwidth reported by Speedsys for C120, A160, P100 units are because those cpus are the only ones with a 40 Mhz front-side bus, so it makes sense that their memory bandwidth would …

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Re: Cyrix 5x86-133 Testing

Posted on 2011-04-08, 07:15

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've just finished a series of testing with the Cyrix 5x86-133 and compiled results with 9 different benchmark programs. These include, Norton Sysinfo v8.0, PC-Config v9.33, PcpBench v1.97, Speedsys v4.78, Cachechk v4.0, Roy Longbottom's Dhrystone, Linpack, and Whetstone. I also cross-compared the …

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Cyrix 5x86-133 Testing

Posted on 2011-04-06, 19:29

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

After much effort, I was able to obtain a Cyrix 5x86-133, 3.7V, G5D9549A for an inflated sum of currency. Its production date is the 49th week of 1995. The production date seems disimilar to the mass 24-unit eBay auction of Cyrix 5x86-133's. (http://www.cpu-world.com/forum/viewtopic.php?p=124976) I …

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Re: Is this a good 486 PCI board?

Posted on 2011-04-06, 00:27

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

How did one of these land in your lap? There have been two of these on eBay for the past little while, but the prices were outrageous, $100-$200 USD. This is a Biostar MB-8433UUD v2.0. I had two of these boards in the past but toss 'em in favour for v3.0 and v3.1. I tried updating one to the latest …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-04-05, 09:32

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Have you tried running Memtest version 4 from a boot floppy and letting it finish the run? http://www.memtest86.com/ This case sounds similar to a case I had which was tough to troubleshoot. I ran this system with the fastest ram and cache settings; everything was set to fast and the system ran well …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-04-05, 05:45

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@udam_u The stepping/revision thing confused me as well. If I were to speculate, Cyrix probably realised that with branch prediction working, other enhancements did not (BWRT, LOOP, RSTK). An executive decision was probably made to not include this stepping rev. in the 120 Mhz cpus due to …

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Re: Pentium overdrive 83 MHz - overclocking options?

Posted on 2011-04-04, 18:43

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@swaaye I appreciate the suggestion for vintage forum. I am there as well, but the pace is a lil' slow. It seems a good number of vogons users are actively using 486 hardware, which is where my interest lies. I may have oversimplified my case -- I do occasionally play Subspace on NT4. @rg100 The IDE …

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Re: Pentium overdrive 83 MHz - overclocking options?

Posted on 2011-04-03, 02:59

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I used the AMD x5-133 socket 3 in my M919 from about Jan 1997 until 2001, after which I switched to a Cyrix 5x86-120 and was blown away by the performance increase in everyday web browsing, office apps, etc. I do not play games, so I cannot vouche for its game worthiness though. A few years …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-04-03, 02:40

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@udam_u Cyrix 5x86-100 Stepping 1 Revision 3 Fabbed 44th week of 1995 Cyrix 5x86-120 Stepping 0 Revision 5 Fabbed 50th week of 1995 It could be that the stepping/revisions numbers do not cross over between different speeds of the 5x86, that is to say that maybe stepping 0, rev5 of the 120 part …

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Re: Pentium overdrive 83 MHz - overclocking options?

Posted on 2011-04-03, 00:44

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A general notice to overclockers, continued use in this state will eventually lead to pre-mature component failure. This is not limited to CPU overclocking, but also to RAM and cache. Northbridge, southbridge, and even superIO ckts have been known to fail prematurely when pushed beyond their limits. …

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Re: Pentium overdrive 83 MHz - overclocking options?

Posted on 2011-04-03, 00:27

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@Tetrium Funny you should ask that, I recently started the following post which coincides with your question, but didn't get much feedback on 'modern' graphics cards. http://www.vogons.org/viewtopic.php?t=27710 I have tried these but was unable to get an image from the monitor. These have been, 1. …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-04-02, 07:03

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

To shed some further light on the question I posed earlier about how to determine which PCI revision exists on your 486-era motherboard, the programs PCI104VK and PC-Config both say, "shows PCI-BIOS version 2.10" on my M919. This seems to be in agreement with Speedsys's claim for PCI 2.10 as well. …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-04-02, 04:56

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I do remember reading up on hack jobs for the RTC, but I do not think it is worth the risk -- other features of the RTC may be inoperative over time (i.e. square wave output, IRQ output, etc). It is a much safer route to replace the entire RTC with a new one. You can get a new Dallas RTC for about …

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Re: Pentium overdrive 83 MHz - overclocking options?

Posted on 2011-04-01, 01:16

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Huh, it is probably chipset related then. The POD83 didn't make any of my non-working PCI graphics cards work. They all work in other PIII-based systems though. Anyone with an Intel chipset 486-PCI motherboard try a Matrox G450?

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