jumper settings for OWC G4 1.3GHz 7457 upgrade card

[indibil]

Hello,
I recently purchased a G4 Cube upgrade card from GigaDesigns to 1.3GHz. When removing the heatsink I have seen that it has a 7457 at 1200.

On the PCB, J1-J5 are used to select the CPU speed multiplier, I was able to find the PDF on google where it explains it, but I have been unable to find how to configure J6-J10, the red circle in the photo, which I suppose is It is used to adjust the voltage. Does anyone have the pdf of these jumpers?

In a blue circle, would it be used to connect a fan?

what would be the maximum stable speed for a 7457-1200?

My idea would be to adapt this processor to a Quicksilver.

Thanks.

 

[indibil]

I found out that it's not GigaDesigns, it's OWC. I have found a guide but it only explains the speed switches, it does not explain anything about the voltage adjustment.

 

[B S Magnet]

I found out that it's not GigaDesigns, it's OWC. I have found a guide but it only explains the speed switches, it does not explain anything about the voltage adjustment.

Paging @dosdude1 …

 

[DearthnVader]

what would be the maximum stable speed for a 7457-1200?

My idea would be to adapt this processor to a Quicksilver.

Thanks.

Each CPU is going to bin out differently.

Check the data sheet for the 7457 and see if you can figure the voltage the jumpers are set to now.

Tho be warned setting the voltage too high can burn your CPU!

 

[dosdude1]

Just need to know what the voltage regulator on the card is, you can look up the datasheet and trace out the pins from the "VID" lines, and figure out how to set them for the desired voltage.

 

[indibil]

In agreement. I was wondering if anyone had the configuration sheet for this card to know the factory settings.

I will investigate then the regulator of the card. Do you think this 7457-1200 can support overclock up to 1.6 or 1.8?

 

[DinoSloar]

Try here , https://eshop.macsales.com/tech_center/processors.cfm

 

[dosdude1]

In agreement. I was wondering if anyone had the configuration sheet for this card to know the factory settings.

I will investigate then the regulator of the card. Do you think this 7457-1200 can support overclock up to 1.6 or 1.8?

7457 should have VCORE voltage of around 1.3V. You'll probably only be able to get a 1.2 GHz-rated one up to around 1.5 - 1.6 GHz, though the L3 cache is usually the biggest problem when overclocking these (the L3 cache runs at a ratio based on the CPU clock speed. If you overclock the L3 cache too much, it causes system instability).

 

[indibil]

Try here , https://eshop.macsales.com/tech_center/processors.cfm

Thanks. I was looking at it and I only find the switch configuration, there is nothing about the jumpers J6-J10

7457 should have VCORE voltage of around 1.3V. You'll probably only be able to get a 1.2 GHz-rated one up to around 1.5 - 1.6 GHz, though the L3 cache is usually the biggest problem when overclocking these (the L3 cache runs at a ratio based on the CPU clock speed. If you overclock the L3 cache too much, it causes system instability).

Okay, thanks. I highly doubt that the Jumpers J6-J10 are for adjusting the speed ratio of the CACHE, right? It probably can't be changed. they are most likely to adjust the VCORE.

 

[dosdude1]

Thanks. I was looking at it and I only find the switch configuration, there is nothing about the jumpers J6-J10



Okay, thanks. I highly doubt that the Jumpers J6-J10 are for adjusting the speed ratio of the CACHE, right? It probably can't be changed. they are most likely to adjust the VCORE.

Correct, L3 cache size and ratio is set by a small amount of data in an SPD EEPROM on the card. At least, that’s the case on all Apple CPU cards with external L2 and L3 cache.