My DQ77KB motherboard seems to drive my 7750 GPU (TDP 55W) just fine, even though the manual says that the pcie x4 slot only supports a draw of up to 25W. I'm considering upgrading my GPU to something with closer to 130W TDP. I have two questions:
(1) Is the 25W warning in the manual a fluke? Or will it only provide that much? Other MB in the same form factor say the same 25W in their manuals (i.e. gigabytes new thin mini itx). The board has an onboard dc-dc converter and is powered by a 330w brick, and with a custom power scheme like that I could see something other than the de facto lead to unexpected power schemes.
(2) To accommodate the 6-pin connector on a better card, I would use an adapter attached to the sata power connector directly on the motherboard. That power connector is designed for hooking up a couple of HDD's, of course, and I couldn't find any comments in the manual about what kind of power draw is acceptable for this power connection. Any idea if it would supply the GPU enough power?
In the manual, it also warns that the cpu socket only supports up to a 65w CPU. It seems like this highly customized board is pretty picky on power usage, according to the manual. I've seen people post online that they have a 77w 3770k running on the same board (with an older version of bios--intels latest version halts bootup if an officially unsupported CPU is installed). In addition, I'm running a graphics card that exceeds intel's specifications. So how unsuccessful would it be for me to go all out with a better GPU?
BTW, if I did increase the system power usage, I would do some VRM cooling, of course.
Update: someone on the Intel forums did something akin to what I want to do. Combined power wires from the sata power, lcd, and system fan connectors, as well as 3 ground connectors on the board, to make a 6-pin connector. Another look at the manual shows 25w max power for the lcd and data connectors. I'm still confused on why my 55W TDP GPU works on the 25W rated pcie slot. Would I get crashes if it was underpowered, or just slower frame rates? With the data I've gathered, I either have 125W that I can feed a GPU (pcie,sata, and lcd connectors), or just 75w (if the pcie is indeed only 25w).
(1) Is the 25W warning in the manual a fluke? Or will it only provide that much? Other MB in the same form factor say the same 25W in their manuals (i.e. gigabytes new thin mini itx). The board has an onboard dc-dc converter and is powered by a 330w brick, and with a custom power scheme like that I could see something other than the de facto lead to unexpected power schemes.
(2) To accommodate the 6-pin connector on a better card, I would use an adapter attached to the sata power connector directly on the motherboard. That power connector is designed for hooking up a couple of HDD's, of course, and I couldn't find any comments in the manual about what kind of power draw is acceptable for this power connection. Any idea if it would supply the GPU enough power?
In the manual, it also warns that the cpu socket only supports up to a 65w CPU. It seems like this highly customized board is pretty picky on power usage, according to the manual. I've seen people post online that they have a 77w 3770k running on the same board (with an older version of bios--intels latest version halts bootup if an officially unsupported CPU is installed). In addition, I'm running a graphics card that exceeds intel's specifications. So how unsuccessful would it be for me to go all out with a better GPU?
BTW, if I did increase the system power usage, I would do some VRM cooling, of course.
Update: someone on the Intel forums did something akin to what I want to do. Combined power wires from the sata power, lcd, and system fan connectors, as well as 3 ground connectors on the board, to make a 6-pin connector. Another look at the manual shows 25w max power for the lcd and data connectors. I'm still confused on why my 55W TDP GPU works on the 25W rated pcie slot. Would I get crashes if it was underpowered, or just slower frame rates? With the data I've gathered, I either have 125W that I can feed a GPU (pcie,sata, and lcd connectors), or just 75w (if the pcie is indeed only 25w).
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