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I have a question in regards to Molex connections... - Page 2

post #11 of 13
Quote:
Originally Posted by xxpenguinxx View Post

I don't even get why we have CPU and PCIe as separate connectors. They use the same voltage, why didn't they just use the ATX/EPS 4 and 8 pin? It would cut down on cable clutter since most GPUs wouldn't need more than a single 8 pin, and they wouldn't need yet another connector. A single 4 pin can handle 192W yet a 8 pin PCIe can only handle 150w. Makes no sense to me.
PCI-E and EPS/ATX are NOT not electrically compatible
If you plug an EPS cable into a video card or a PCI-E cable into a motherboard you are going to kill it which is the reason why they are made so they cant be switched.
Edited by shilka - 4/17/17 at 6:30am
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post #12 of 13
Quote:
Originally Posted by shilka View Post

PCI-E and EPS/ATX are NOT not electrically compatible
If you plug an EPS cable into a video card or a PCI-E cable into a motherboard you are going to kill it which is the reason why they are made so they cant be switched.

They are just 12V and ground. The only thing I can think of is PSU manufactures were cheap and didn't want to use the thicker gauge cable for PCIe devices which is why they limited it to 75W for the 6 pin, which is only 2 wires on older PSUs and those adapters..
post #13 of 13
Quote:
Originally Posted by xxpenguinxx View Post

I don't even get why we have CPU and PCIe as separate connectors. They use the same voltage, why didn't they just use the ATX/EPS 4 and 8 pin? It would cut down on cable clutter since most GPUs wouldn't need more than a single 8 pin, and they wouldn't need yet another connector. A single 4 pin can handle 192W yet a 8 pin PCIe can only handle 150w. Makes no sense to me.

PCI-E 6 pin can handle 200w, and the 8 pin pci-e can handle 300w. The only reason they are said to be lower is because of PCI-Express specification itself lists auxiliary power inputs as 75w and 150w, has nothing to do with what the molex connectors and power wire they use can handle.



Also, all the pins from a PSU are Molex. The thread title and OP should specify the 4-pin peripheral connectors, not simply say "Molex" since that is nowhere close to correct as every connectors from the PSU for every component is a Molex connector.
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