jonnyGURU
10-19-2006, 07:36 AM
I thought I should post this because I didn't find it documented well in the Silverstone manual....
The ST75F does have four separate 12V rails.
Each modular PCI-e cable has two PCI-e connectors on it and each connector is labeled "12V3", "12V3", "12V4", "12V4" (see 1st photo.) But the connectors are modular and there are two interfaces that they can plug into, are interchangable... so how do you know which is 12V3 and 12V4?
The manual states that the division of rails is:
12V1: CPU-2 (via EPS12V 8-pin), ATX12V 4-pin
12V2: CPU-1 (via EPS12V 8-pin), EPS12V 6-pin AUX
12V3: main ATX 24-pin, one PCI-e interface
12V4: peripheral Molexes, SATA, other PCI-e interface
I tried tracing the wires on the modular interface PCB, but I couldn't tell what went where (see 2nd and 3rd image attached.) So I decided, since the main ATX was on 12V3, I'd put a 10A load on it. If I can put a 20A load on one particular PCI-e connector, then that particular connector couldn't be the PCI-e that was on the same rail as the 24-pin! :D
So I did and I found that the PCI-e connector to the far right, as the PSU is sitting fan up (as shown in 4th picture,) is 12V4. The other PCI-e is 12V3.
The ST75F does have four separate 12V rails.
Each modular PCI-e cable has two PCI-e connectors on it and each connector is labeled "12V3", "12V3", "12V4", "12V4" (see 1st photo.) But the connectors are modular and there are two interfaces that they can plug into, are interchangable... so how do you know which is 12V3 and 12V4?
The manual states that the division of rails is:
12V1: CPU-2 (via EPS12V 8-pin), ATX12V 4-pin
12V2: CPU-1 (via EPS12V 8-pin), EPS12V 6-pin AUX
12V3: main ATX 24-pin, one PCI-e interface
12V4: peripheral Molexes, SATA, other PCI-e interface
I tried tracing the wires on the modular interface PCB, but I couldn't tell what went where (see 2nd and 3rd image attached.) So I decided, since the main ATX was on 12V3, I'd put a 10A load on it. If I can put a 20A load on one particular PCI-e connector, then that particular connector couldn't be the PCI-e that was on the same rail as the 24-pin! :D
So I did and I found that the PCI-e connector to the far right, as the PSU is sitting fan up (as shown in 4th picture,) is 12V4. The other PCI-e is 12V3.