The resistors in the bottom right which are circled in black in the photo below are with 95% probability clock control jumpers for the G5. Will someone please try to jump one of them. The issue lies that I can not tell which PLLs are which.
According to the IBM datasheet:
BUS_CFG(0:2)
The resistors that select core clock to bus clock ratio are:
A11, D12, B11
I am 95% sure that the three resistors are A11, D12, and B11, I do not now which is which, if you jump a resistor you are setting your processor to a completely unknown frequency.
BUS_CFG(0:2)
.....................Ratio
...............................Notes
000................2:1
001................3:1
010................4:1..........1
011................6:1..........1
100................8:1..........2
101................12:1........3
110................24:1........2
111................Not valid
The MSB-PLL is the first objective, it has been completed. The FSB-PLL is the second objective, with the
FSB-PLL overclocking would be possible without a new processor!
I soon will take photos of my Quad 2.5 daughtercard and inspect the liquid cooling system for leaks.
I cannot afford to buy another G5 with the 970FX and a CPU daughtercard, if someone could send pictures of your motherboard, and daughtercard, the one pictured is a 970MP, or if you are feeling very generous donate your G5?
Sadly, none of that ratios (except the original) would work. 3:1, the lowest above the stock 2:1 would make the 2.3 970MP run at 3.45Ghz, which obviously is too high.
A way to make it possible is to use a 2.5 970MP from a Quad or a 2.7 970FX (they should be the same, they are pin compatible so I don't think they changed anything in the daughtercard) in a motherboard with a slowest bus. For example, the 970FX in a PowerMac G5 Late 2005 dual 2.0Ghz. Those models use a 1Ghz FSB, so a 2.7 970FX card will run at 2.0Ghz. With the PLL modified to 001 (3:1 ratio) it should run at 3.0Ghz, which is a really slight overclock from 2.7. (Blue section originally posted by Andropov)
According to the IBM datasheet:
BUS_CFG(0:2)
The resistors that select core clock to bus clock ratio are:
A11, D12, B11
I am 95% sure that the three resistors are A11, D12, and B11, I do not now which is which, if you jump a resistor you are setting your processor to a completely unknown frequency.
BUS_CFG(0:2)
.....................Ratio
...............................Notes
000................2:1
001................3:1
010................4:1..........1
011................6:1..........1
100................8:1..........2
101................12:1........3
110................24:1........2
111................Not valid
The MSB-PLL is the first objective, it has been completed. The FSB-PLL is the second objective, with the
FSB-PLL overclocking would be possible without a new processor!
I soon will take photos of my Quad 2.5 daughtercard and inspect the liquid cooling system for leaks.
I cannot afford to buy another G5 with the 970FX and a CPU daughtercard, if someone could send pictures of your motherboard, and daughtercard, the one pictured is a 970MP, or if you are feeling very generous donate your G5?
Sadly, none of that ratios (except the original) would work. 3:1, the lowest above the stock 2:1 would make the 2.3 970MP run at 3.45Ghz, which obviously is too high.
A way to make it possible is to use a 2.5 970MP from a Quad or a 2.7 970FX (they should be the same, they are pin compatible so I don't think they changed anything in the daughtercard) in a motherboard with a slowest bus. For example, the 970FX in a PowerMac G5 Late 2005 dual 2.0Ghz. Those models use a 1Ghz FSB, so a 2.7 970FX card will run at 2.0Ghz. With the PLL modified to 001 (3:1 ratio) it should run at 3.0Ghz, which is a really slight overclock from 2.7. (Blue section originally posted by Andropov)
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