AMD 5x86 X5-133 (now with POD)

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Re: AMD 5x86 X5-133

Postby derSammler » 2018-8-23 @ 19:02

mrau wrote:what are the other steps that are missing here?

DVD.PNG

This doesn't even include audio decoding, input handling, i/o operations, etc.
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Re: AMD 5x86 X5-133

Postby derSammler » 2019-7-02 @ 18:32

Today, I finally replaced the AMD 5x86 X5-133 with an Intel Pentium Overdrive. And guess what? It blows the X5 away even at 83 MHz and the X5 running at 160 MHz. Speedsys gives 59 for the X5 at 160 MHz and 60 for the POD at 83 MHz. Quake timedemo results in ~16 fps for both, but the game still plays much better on the POD, since there are no slowdowns as with the X5. The X5 reaches higher fps on very simple scenes, but completely fails when light effects are kicking in.

IMG_20190702_192332065.jpg


Tried the POD at 100 MHz, which gives almost a score of 73 with speedsys. Sadly, it's not running stable at 100 MHz. But I'm very pleased with it even at 83 MHz. :)
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Re: AMD 5x86 X5-133 (now with POD)

Postby Intel486dx33 » 2019-7-03 @ 16:55

How well did it play MP3 files with Winamp program on the AMD-5x86-133 and on the Intel Pentium overdrive CPU ?
Last edited by Intel486dx33 on 2019-7-03 @ 17:09, edited 1 time in total.
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Re: AMD 5x86 X5-133 (now with POD)

Postby derSammler » 2019-7-03 @ 17:03

With WinAmp 2.95, it plays MP3s just fine, and you can still click around in Windows without getting drop-outs. But even my DX4-100 with no L2 cache does not struggle with MP3s (well, using 8-bit playback there, as the used sound card is buggy in 16-bit). All my MP3s are 192 kbps, however, it may not work well with higher bitrates.
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Re: AMD 5x86 X5-133 (now with POD)

Postby Intel486dx33 » 2019-7-04 @ 00:36

The purpose for building a 486 66/100mhz or AMD 5x86-133 is so you can downclock the CPU between 25mhz and 133mhz.
You can do this with the Turbo switch cutting the CPU speed in half to 66mhz from 133mhz. and then with the "Setmul" utility reducing the CPU down to the performance of a 386sx-25mhz.
By disabling the CPU L1 cache. Reason to do this is to be able to play CPU speed critical old DOS games like "Wing Commander-1"
This way you can play a large range of DOS games on your computer. Old and Modern DOS games.
By putting an Intel Pentium over drive CPU in your computer you may be unable to get to these Low CPU speeds.
Check and see how low you can clock down your computer with the Turbo switch enabled and L1 Cache disabled.
You can disable L1 CPU cache with "Setmul" utlility.
You can use a benchmark utility like "Topbench" to check your CPU speed in real time. And "Speedsys"
Otherwise you just have a regular class Pentium computer. I thought the purpose for these old DOS computers was to play as many old DOS games.
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Re: AMD 5x86 X5-133 (now with POD)

Postby treeman » 2019-7-04 @ 00:47

maybye he doesn't like 386 games
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Re: AMD 5x86 X5-133 (now with POD)

Postby bjwil1991 » 2019-7-04 @ 02:10

Doesn't the Pentium OverDrive, much like the early Pentiums of the early 1990's have the infamous FDIV bug? I had a POD-83 until the pins got bent accidentally and it won't run without them. I have an Evergreen 586 (DX5-133) in my Packard Bell Pack-Mate 28 Plus and it runs better than the DX4-100 OverDrive. Might get another Pentium OverDrive sometime, but, they charge a lot for a used one that's not in a box.
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Re: AMD 5x86 X5-133 (now with POD)

Postby derSammler » 2019-7-04 @ 06:15

@Intel486dx33:

I'm not really interested in having one retro system for all games. I have other systems ranging from an original 5150 up to a 486dx2-50 for older games - and also faster systems for newer games. In most cases though, I just use MoSlo, which works for most old games on faster systems just fine.

However, the POD has a nice feature if you care about slowing down: removing the fan (or cutting the sense pin) sets the multiplier to 1x, so you can run it with 25 Mhz if you want. With no L1/L2 cache, it will probably crawl like a fast 286 then.

Doesn't the Pentium OverDrive, much like the early Pentiums of the early 1990's have the infamous FDIV bug?

Most likely, yes. But the bug isn't really relevant unless you use the system for scientific work. And even then, you probably won't ever notice it. (edit: according to most sources, the POD is not affected by the FDIV bug)
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