4 pin molex to 6pin pci-e safe? or psu 6pin pci-e?

craga2012 · Jun 16, 2013

Hello

I have this psu - http://

My question is just that I bought the Sapphire Radeon 7770 and it came with a 4 pin molex-6 pin cable. But should I use this connector, or the 6pin that comes with the power supply? The molex helps me save room in the case but i don't know if using molex is safe.

The pc seems a bit louder when using the pci-e from the psu rather than the moleex, but maybe its just using the right amount of power now? I don't know

Any help appreciated

Sakkura · Jun 16, 2013

Using a 6-pin PCIe power connector is much better. The adapter is just included in case the PSU doesn't have a 6-pin PCIe power connector.

mafisometal · Jun 16, 2013

Should be fine. most graphics cards include dual molex to 6-pin PCI-E. Thats usually fine as long as both molex have their own connection. To get 100% stable continuity from supply both molex need good connection.

Pinhedd · Jun 16, 2013

craga2012 :

Molex connectors are rated to deliver 40 watts. 6 pin PCIe connectors are rated to deliver 75 watts each.

PCIe 1.x and 2.0 allow for 75 watts of power to be drawn from the motherboard itself when using a 16x slot. PCIe 2.1 and 3.0 can deliver 150 watts when using a 16x slot.

For compatibility reasons, many GPU manufacturers will only ever draw 75 watts from the socket itself, drawing the rest from the dedicated PCIe power connectors. Since the 7770 is rated at 80 watts, it needs a power connector to make up for the 5 watt shortfall.

Since your 7770 will only draw a few watts from the auxiliary power connector, it is safe to couple it to a 40 watt Molex connector if you so desire. However, this is safe for low power cards only. Higher power cards should always use dedicated PCIe connectors.

d359233drdrbcom · Jan 27, 2014

Pinhedd :

craga2012 :

Molex connectors are rated to deliver 40 watts. 6 pin PCIe connectors are rated to deliver 75 watts each.

PCIe 1.x and 2.0 allow for 75 watts of power to be drawn from the motherboard itself when using a 16x slot.
PCIe 2.1 and 3.0 can deliver 150 watts when using a 16x slot.

For compatibility reasons, many GPU manufacturers will only ever draw 75 watts from the socket itself, drawing the rest from the dedicated PCIe power connectors. Since the 7770 is rated at 80 watts, it needs a power connector to make up for the 5 watt shortfall.

Since your 7770 will only draw a few watts from the auxiliary power connector, it is safe to couple it to a 40 watt Molex connector if you so desire. However, this is safe for low power cards only. Higher power cards should always use dedicated PCIe connectors.

can you please post source of "PCIe 2.1 and 3.0 can deliver 150 watts when using a 16x slot."?
can they deliver 150 w if not x16?

Pinhedd · Jan 27, 2014

d359233drdrbcom :

Pinhedd :

can you please post source of "PCIe 2.1 and 3.0 can deliver 150 watts when using a 16x slot."?
can they deliver 150 w if not x16?

Hi,

I can't seem to find a hard source and since I'm not a PCI-SIG member I can't check it against the data sheet. However, my understanding is that PCIe 2.x+ requires that the slot be capable of delivering 150 watts of sustained power. However, it appears that the power specifications still only allow for 75 watts from the socket and most devices obey this constraint.

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4 pin molex to 6pin pci-e safe? or psu 6pin pci-e?

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