Benchmarks with CPU to PCI Post Write enabled.

Not bad.. I'm in the process of getting up my system with the same board and a X5-133... would be already running if not the exploding tantalum near power connector...pfffff

let's see what my numbers are.

Tried yesterday my Cyrix 5x86/100 at 2x66 but didn't even post. Not so surprising, it's damn bad overclocker, need 4V to get 120MHz stable. Too bad that 486SP3 don't have 60MHz FSB option.

you could always mod external clock generator 😜
$3 "25MHZ Si5351A I2C Clock Generator Breakout Board 8KHz to 160MHz" + arduino or some serial to I2C converter to program frequencies

Or buy this: https://migronelectronics.bigcartel.com/produ … g-underclocking

choice of 50 53 60 66 MHz doesnt sound that appealing for overclocking compared to $3 https://learn.adafruit.com/adafruit-si5351-cl … eakout/assembly with precision down to single hertz https://rfzero.net/documentation/tools/si5351 … frequency-tool/

I will have to boot up my system and do some tests.
Same board, I'm running a Cyrix 5x86 @ 120MHz (40x3)

Interesting. This inspired me to check the ASUS VL/I-SV2GX4’s MX8315PC clockgen datasheet. Low-and-behold, it has 60MHz and 66MHz options too. Intriguing stuff.

Does anyone know if there is a PCI divider on this board, like the LS-486E?

EDIT: Your Intel DX4 at 2 x 66MHz seems really fast. It’s not too far off from an Am5x86-160MHz, in SpeedSys at least. Quake also is really impressive per-clock. I wonder if there’s any headroom to go further on these Intel chips?

You can try some different PCI VGAs in there, what's "fast" at 33Mhz PCI isn't necessarily the best overclocked a lot, some "slow" cards have conservative timings that mean they clock to the moon. In particular if you wanna look for VGA chipsets that appeared on PCIx cards without need for a buffer chip, then those on 32bit PCI should have some headroom.

WJG6260 wrote on 2023-03-23, 15:43:

Interesting. This inspired me to check the ASUS VL/I-SV2GX4’s MX8315PC clockgen datasheet. Low-and-behold, it has 60MHz and 66MHz options too. Intriguing stuff.

Does anyone know if there is a PCI divider on this board, like the LS-486E?

EDIT: Your Intel DX4 at 2 x 66MHz seems really fast. It’s not too far off from an Am5x86-160MHz, in SpeedSys at least. Quake also is really impressive per-clock. I wonder if there’s any headroom to go further on these Intel chips?

Tried 150MHz (3x50) with slightly higher voltage but got only post and then hangs. With default voltage won't even post. 133MHz works flawlessly with default voltage.

I'm really struggling to get my Cyrix 5x86 stable @120MHz, needs 4V voltage and still it's on the edge. This i486DX4/133 is actually almost as fast so I'm thinking if I just take Cyrix out and use this DX4 instead.

WJG6260 wrote on 2023-03-23, 15:43:

Interesting. This inspired me to check the ASUS VL/I-SV2GX4’s MX8315PC clockgen datasheet. Low-and-behold, it has 60MHz and 66MHz options too. Intriguing stuff.

Does anyone know if there is a PCI divider on this board, like the LS-486E?

EDIT: Your Intel DX4 at 2 x 66MHz seems really fast. It’s not too far off from an Am5x86-160MHz, in SpeedSys at least. Quake also is really impressive per-clock. I wonder if there’s any headroom to go further on these Intel chips?

Hello,

Do you have jumper settings for the SV2GX4 for 60MHz and 66MHz?

Sorry to hijack this thread.

I have the same board. And i'm having a strange problem. (cpu is a X5133). Jumpers are set fine.. the thing is.

I'm using a isa dignostic post card to help. So:

1) power on.. nothing.. post card --:--... but i can see reset led always on.. hmmm
2) put my ginger in the bios chip just touching and reset led goes off, and clock led goes up.. so power on again and it boots... yuuupii..
3) take my finger and nothing again..

4) take the bios chip off.. clean it with spray.. and the socket.. put it back in... everything is making contact..
5) power on... nothing...
6) my finger again, once twice, reset led off, clock led on.. power on again, working..

WTF ?

7) take the bios chip out again.. put it again.. only works with my fingers..
IS THIS BOARD A WOMEN???

come on.. what the fuck is going on.. is not bad contact within the bios chip.. seems like a gounded problem.. my habds touch the metal case, and the bios chip and , i dont know, it gets connected..

any ideas ?

dj_pirtu wrote on 2023-03-24, 05:23:

WJG6260 wrote on 2023-03-23, 15:43:

Interesting. This inspired me to check the ASUS VL/I-SV2GX4’s MX8315PC clockgen datasheet. Low-and-behold, it has 60MHz and 66MHz options too. Intriguing stuff.

Does anyone know if there is a PCI divider on this board, like the LS-486E?

EDIT: Your Intel DX4 at 2 x 66MHz seems really fast. It’s not too far off from an Am5x86-160MHz, in SpeedSys at least. Quake also is really impressive per-clock. I wonder if there’s any headroom to go further on these Intel chips?

Tried 150MHz (3x50) with slightly higher voltage but got only post and then hangs. With default voltage won't even post. 133MHz works flawlessly with default voltage.

I'm really struggling to get my Cyrix 5x86 stable @120MHz, needs 4V voltage and still it's on the edge. This i486DX4/133 is actually almost as fast so I'm thinking if I just take Cyrix out and use this DX4 instead.

I had some stability problems with my Cyrix 100gp at 120 (40x3) with my only VLB video card. A Trident something or another, but once I put in a PCI video card my problem went away. This is at stock voltage as well. The PCI card I am using is a Jaton Tseng Labs ET6000, but I also tried a ATI Rage XL and a Trident GUI9480 I THINK was the model. All PCI cards seemed to be more stable than the VLB card.

Jasin Natael wrote on 2023-03-27, 13:35:

dj_pirtu wrote on 2023-03-24, 05:23:

WJG6260 wrote on 2023-03-23, 15:43:

Interesting. This inspired me to check the ASUS VL/I-SV2GX4’s MX8315PC clockgen datasheet. Low-and-behold, it has 60MHz and 66MHz options too. Intriguing stuff.

Does anyone know if there is a PCI divider on this board, like the LS-486E?

EDIT: Your Intel DX4 at 2 x 66MHz seems really fast. It’s not too far off from an Am5x86-160MHz, in SpeedSys at least. Quake also is really impressive per-clock. I wonder if there’s any headroom to go further on these Intel chips?

Tried 150MHz (3x50) with slightly higher voltage but got only post and then hangs. With default voltage won't even post. 133MHz works flawlessly with default voltage.

I'm really struggling to get my Cyrix 5x86 stable @120MHz, needs 4V voltage and still it's on the edge. This i486DX4/133 is actually almost as fast so I'm thinking if I just take Cyrix out and use this DX4 instead.

I had some stability problems with my Cyrix 100gp at 120 (40x3) with my only VLB video card. A Trident something or another, but once I put in a PCI video card my problem went away. This is at stock voltage as well. The PCI card I am using is a Jaton Tseng Labs ET6000, but I also tried a ATI Rage XL and a Trident GUI9480 I THINK was the model. All PCI cards seemed to be more stable than the VLB card.

Actually I'm using QDI V4S471 motherboard with the Cyrix, so only VLB there. Cyrix is stable as long voltage is 4V at minimum, 3,9V is not enough. There's lot of Vdrooop so it needs to be little over 4V.

Yeah, it's a lot but stays cool. Works as long as works.

I have several boards with this revision, but I played with a AM5x86-133 @66FSB there and that didn't want to POST, so I sticked with playing with my UM8886/8881 mobos with better success.

dj_pirtu wrote on 2023-03-28, 07:40:

Jasin Natael wrote on 2023-03-27, 13:35:

dj_pirtu wrote on 2023-03-24, 05:23:

Tried 150MHz (3x50) with slightly higher voltage but got only post and then hangs. With default voltage won't even post. 133MHz works flawlessly with default voltage.

I'm really struggling to get my Cyrix 5x86 stable @120MHz, needs 4V voltage and still it's on the edge. This i486DX4/133 is actually almost as fast so I'm thinking if I just take Cyrix out and use this DX4 instead.

I had some stability problems with my Cyrix 100gp at 120 (40x3) with my only VLB video card. A Trident something or another, but once I put in a PCI video card my problem went away. This is at stock voltage as well. The PCI card I am using is a Jaton Tseng Labs ET6000, but I also tried a ATI Rage XL and a Trident GUI9480 I THINK was the model. All PCI cards seemed to be more stable than the VLB card.

Actually I'm using QDI V4S471 motherboard with the Cyrix, so only VLB there. Cyrix is stable as long voltage is 4V at minimum, 3,9V is not enough. There's lot of Vdrooop so it needs to be little over 4V.

Yeah, it's a lot but stays cool. Works as long as works.

Oh ok, I must have gotten confused. Sorry about that. As long as it stays cool I wouldn't worry much about the voltage.

It's a shame that this board can't use EDO modules. Hard to find good FPM that will work at 66MHz.

The RetroWEB says it supports..

Only specific chipset revision has EDO support.