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First post, by Intel486dx33

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Does anyone have any info on this CPU.
PNY Am5x86-P75 AMD AM486DX5-133W16BHC Chip

Who manufactured it ?
It's an AMD 5x86-P75-133 right ?
it works on 25mhz bus and 33mhz bus with 5v.
Any info on the dip switches on bottom of CPU ?
I want to put it in my IBM PS/1 486sx-25 with 169-pin overdrive socket.

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Last edited by Intel486dx33 on 2019-09-02, 14:42. Edited 2 times in total.

Reply 1 of 34, by Brickpad

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Trinity Works Power Stacker 5x86. Bought a couple of those myself a few months back. These were designed to handle 5v systems.

PowerStacker 5x86
https://web.archive.org/web/19980703085652fw_ … 6data_body.html

DIP switch settings:
https://web.archive.org/web/19980703090253/ht … switchreve.html

Reply 4 of 34, by Intel486dx33

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Installation guide:

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Here is the installation guide and box.
Should I use 3x or 4x in DIP switch settings ?

Link to software that comes with this CPU
SysChk
http://www.syschk.com/

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Last edited by Intel486dx33 on 2019-09-02, 14:12. Edited 3 times in total.

Reply 5 of 34, by GigAHerZ

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If your bus is at 33MHz, then to have CPU speed at 133MHz, you need multiplier to be ...?

The answer is even written on the box! 4th point.

"640K ought to be enough for anybody." - And i intend to get every last bit out of it even after loading every damn driver!

Reply 7 of 34, by Intel486dx33

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Okay, I see.
So I want to use 4x for a total speed of 133mhz on 33mhz bus.
and 3x for a total speed of 75mhz on a 25mhz bus.

Now,
Should I use "Pass through" or "Write through? ( this setting is for my motherboard cache right ? ).

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Last edited by Intel486dx33 on 2019-09-01, 19:39. Edited 1 time in total.

Reply 8 of 34, by Intel486dx33

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derSammler wrote:

Since the CPU was factory-installed, leave the dip switches as they are. They are correct already!

It's a used CPU from ebay and I don't know if the jumpers were tampered with.

Reply 9 of 34, by CuPid

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Intel486dx33 wrote:

Okay, I see.
Should I use "Pass through" or "Write through? ( this setting is for my motherboard cache right ? ).

No, I think this refers to the L1.
As most upgrade devices, it sets the L1 in WT mode for compatibility.
However, in this case this is also possible to force the WB mode, in case the BIOS would support it.

I need a vacation.

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Reply 10 of 34, by Intel486dx33

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CuPid wrote:
No, I think this refers to the L1. As most upgrade devices, it sets the L1 in WT mode for compatibility. However, in this case t […]
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Intel486dx33 wrote:

Okay, I see.
Should I use "Pass through" or "Write through? ( this setting is for my motherboard cache right ? ).

No, I think this refers to the L1.
As most upgrade devices, it sets the L1 in WT mode for compatibility.
However, in this case this is also possible to force the WB mode, in case the BIOS would support it.

Well, In the install instructions they refer to it as "Pass through" or "Write through?
See PDF file above.

Reply 11 of 34, by CuPid

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The write-back settings are listed in the second page linked by Brickpad :

https://web.archive.org/web/19980703090959/ht … ddsettings.html

I have no idea of what pass-through mean.

I need a vacation.

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Reply 12 of 34, by derSammler

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CuPid wrote:

As most upgrade devices, it sets the L1 in WT mode for compatibility.
However, in this case this is also possible to force the WB mode, in case the BIOS would support it.

The L1 cache is inside the CPU. The rest of the system won't care or even notice whether it's WT or WB.

This is a combination of an adapter and a CPU. The dip switches are there to configure the CPU used. This has been done by the manufacturer already. So for the third time: don't mess with the dip switches, there's no need to.

Reply 13 of 34, by Intel486dx33

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This CPU should work with most 486 motherboards right?
Even though it is a 169-pin CPU it will still fit in most 168-pin sockets and pin #169 should not matter if it is connected or not. The CPU should still operate right ?
Wether in an Overdrive socket to standard 168-pin 486 socket.
Almost all 486 CPU sockets have an opening for the pin #169 ( extra pin in middle of CPU ).

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Reply 14 of 34, by Intel486dx33

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More photos:

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Reply 15 of 34, by croton64

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Intel486dx33 wrote:

Should I use "Pass through" or "Write through? ( this setting is for my motherboard cache right ? ).

Motherboard L2 caches were Write-Through and Write-Back, maybe you should check a little more before actual testing... don't know what it means PassThrough.

Reply 18 of 34, by GigAHerZ

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Read through would effectively mean no cache at all. 😁 I don't think it's the worst 486 ever, having similar performance per MHz as 386. 😁 (Even 486SLC and 486DLC would be faster having 1kB of cache on chip)

"640K ought to be enough for anybody." - And i intend to get every last bit out of it even after loading every damn driver!

Reply 19 of 34, by mwenek

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Hey all. I have one of these versions of the Am5x86-P75 (refer to photo!)
Any idea what the cut wires lead to?
My guess is an old fan that was cut off as it is an Evergreen Overdrive model.
I appreciate any insight before I fire it up.
Edit: Does the WB/WT cache option on this chip itself refer to its internal cache or the MB cache?

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Win98SE Box: PIII 850, 128MB, 8 GB HDD, CL Live!, ATI 9600XT, 2x Diamond Voodoo 2 8MB
DOS Box: Intel 80 Mhz P24T Socket 3 OD, 16MB, 128MB CF Drive, Number 9 VLB, SiiG VLB IDE, SoundBlaster 16 ISA/WaveBlaster