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Molex pcie 8 pin connector4/22/2024 ![]() ![]() Without the GPU_PWR connected, you can't get video out of a video card, not even a lowly GT 1030 DDR4. Turns out that: without the EPS/CPU connector in, the PC won't boot, and the CPU fan won't even spin up. An 8-pin connector above the uppermost PCIe slot labeled GPU_PWR. Disconnected various things, along with a 4-pin EPS/CPU connector, and. So, I decided to try with a known good PSU I had, and proceeded to remove the old one. Also note that it's not the original PSU that came with the Alienware, but an Apevia (yes, you may cringe now). I was told that the previous owner had fired it up with the PSU switched to 240V rather than 115V, and Bad Things happened, which included sparks flying from the PSU. It has dual PCIe x16 slots, and it has a 4-pin EPS/CPU connector near the CPU. It's a Dell Alienware (R5, and has a 6th gen i7). But what if it's 12 total pins, a 4-pin near the CPU, and an 8-pin several inches away from that 4-pin? In this case, I was tasked with diagnosing a PC. "But, King_V, what the hell do you mean? How many EPS/CPU connectors does one need? It's either a 4-pin or an 8-pin, and most modern PSUs have the 4+4 setup." The extended, overly verbose version of this follows: But what about PCIe-to-EPS/CPU? Is it safe to use such an adapter if your PSU doesn't have enough EPS/CPU connectors? The key issue is ohm's law (V=IR) voltage drop and Joule's law (P=I²R) power dissipation on the cable from the supply as well as the poor connectors that probably aren't designed for the current - what's your graphics card gonna do if its "12v" input drops to 7.So, I'm usually the first one to say Molex-to-PCIe and SATA-to-PCIe adapters are a fire waiting to happen. I'm not sure what the power profile for the card you want to test is like, but PCIe×8 connectors should always come direct from the supply if possible, and you shouldn't try to use an adapter to split one supply wire into multiple wires.Īs a personal anecdote, when I upgraded from a GTX1060 to an RTX3070, I initially tried a 1:2 PCIe×8 splitter (knowing it likely wouldn't work but wanting to see what would happen) and the results were that the whole system would crash under graphics load - but when I changed it to two PCIe×8 cables direct from the power supply, everything worked (and continues to work) just fine. Send the moderators a message and we'll unblock it as soon as possible. If you can't find your submission it was probably caught by Reddit's spam filter. Submit your favorites here! Related subreddits The Scientist and Engineer's Guide to Digital Signal Processing.If you find a post violating one of these rules please report it so the mods can review it ASAP. Posts related to education that are not specifically EE should be taken to /r/EngineeringStudents. Posts about building electrical (residential or industrial) as well as electrical grid systems should be taken to /r/electricians. r/gadgets is a better place for non-engineering problems. No tech support questions on consumer products, unless it is truly an engineering problem. Generic "Please solve this problem" posts will be removed.ĥ.No Consumer Product Tech Support Questions If you'd like help with an assignment, feel free to post the question along with your progress so far and specific questions that you have. However, if we see off topic, an influx and/or multiple posts (more than one a day) from a single user, they will be removed at the moderators discretion. Some exceptions can me made for personal websites and blogs for things such as scholarly research papers and reports.Ī sprinkle of funny posts help keep the sub from becoming stale. No advertising of products, services or personal websites/blogs. Intelligently explain why they are wrong, don't just say they're an "idiot". Welcome to /r/ElectricalEngineering! A place to ask questions, discuss topics and share projects related to Electrical Engineering. ![]()
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