P4 connector to video card?

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Mmiller40gt

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Mar 10, 2013
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I have a 700 watt psu and want to replace my 5770 gpu with a 7950. I only see a 6+2 cord labeled pci (6 plugged into 5770) and a p4 connector that has the exact same configuration as the 6+2 minus the 2. I know the p4 is for older motherboards. Was wondering if its the same wattage as the pci plug? If not I guess I'm screwed getting a 7950.
 
Solution
ko888
For a system using a single Radeon HD 7950 graphics card AMD specifies a minimum of a 500 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 30 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.

Overclocking of the CPU and/or GPU(s) will require an additional increase to the maximum combined +12 Volt continuous current ratings...
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Mmiller40gt

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That's good news. I do have 2 molex bundles coming off the powersupply. The both have multiple molex connectors. Can I use 2 on the same wire? The reason I ask is I have 2 small case fans hooked to one of the two. If they need to be on separate wires will the fans pull enough power to cause problems?
 
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ko888

ko888

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Feb 18, 2009
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For a system using a single Radeon HD 7950 graphics card AMD specifies a minimum of a 500 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 30 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.

Overclocking of the CPU and/or GPU(s) will require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

The Antec EarthWatts 650 (EA 650), with its maximum combined +12 Volt continuous current rating of 45 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is way more than sufficient to power your system configuration with a single Radeon HD 7950 graphics card.
 
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Mmiller40gt

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Mar 10, 2013
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Thanks ko888. I called antec because online it says its should have a 6+2 AND a 6 pin PCI-E connections like your posted. Aprarrently antec made a silver and a green version. The silver (mine) only has the 6+2, the newer green version has both. So I'm still stuck with pulling two molex connectors to get the extra 6 pin I need. The guy at Antec kept saying it "should" work fine. Although that was not very reassuring. I found mixed reviews online of how well that works. 2 molex should handle up to 120 watts, the 6 pin should only pull 75 watts. I'm not sure about what power rail they are on. That stuff is kinda over my head.

I do have my 3770k overclocked to 4.5 ghz but at stock voltage. I also plan to over clock the 9750. I really do not wanna spend another 100$ on a power supply. That will up my gpu upgrade to 400$ish. Could get the 9770 for that.
 
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ko888

ko888

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That's one of the idiotic things that Antec does. They will reuse the same model number when they revise the PSU. This is done so that old stock doesn't get stuck on the shelves especially if the consumer doesn't know that there is a newer revision.

The revision that JonnyGURU reviewed has the one 6-pin and one (6+2)-pin PCI Express supplementary power connectors.
 
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ko888

ko888

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If it's a decent quality adapter cable you shouldn't experience a voltage drop to the graphics card.

The cheap quality adapters have a loose connection that causes electrical resistance leading to a voltage drop when it reaches the graphics card and that may cause the graphics card to misbehave.
 
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