bg8780
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Long story short, it's looking like my X58 Classified 3 (E770) is on it's last legs. Sad day, I love this platform. I'm looking to replace with a X299 Dark or FTW and have questions regarding power. I see they both have two 8-pin CPU power headers, as does my X58 but the second is optional. Is this the same for X299? Is the second 8-pin optional for additional power? The PSU I'll be using is this old but stellar Corsair unit: https://www.newegg.com/Product/Product.aspx?Item=N82E16817139007 and it only has one 8-pin for the CPU. I plan on pairing this board with a 7820x (or equivalent replacement that drops Q3 2018) but I'm not looking to go for insane OC's. I'll probably shoot for 4.4-4.6ghz on all cores but nothing beyond that. Do you see that being achievable with one 8-pin CPU power? For reference, my i7 970 was rock solid at 4.2ghz@1.32v with single 8-pin and that's a 130w chip. (7820x is 140w TDP, so it's close) From reviews it's looking like the i7 970 pulls 377w at 4ghz. I'm not able to find overclocked power consumption on the 7820x. Thanks in advance!
post edited by bg8780 - 2018/08/01 09:16:15
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Sajin
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Re: X299 and Legacy PSU
2018/08/01 12:57:07
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Taken directly from the x299 dark manual...
"For optimal performance with Intel® Core™ X-series i9 Skylake-X processors, BOTH connectors must be plugged in with CPU power cables."
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GGTV-Jon
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Re: X299 and Legacy PSU
2018/08/01 13:02:30
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I thought they split / balanced the VRM load between the two connectors.
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bg8780
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Re: X299 and Legacy PSU
2018/08/01 13:48:56
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Sajin
Taken directly from the x299 dark manual...
"For optimal performance with Intel® Core™ X-series i9 Skylake-X processors, BOTH connectors must be plugged in with CPU power cables."
7820x is an i7. So I'm in the clear with just one connector?
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Sajin
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Re: X299 and Legacy PSU
2018/08/01 13:51:25
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For stock it would be fine with one, but since you want to overclock I would recommend two.
post edited by Sajin - 2018/08/01 13:56:27
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GGTV-Jon
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Re: X299 and Legacy PSU
2018/08/01 14:30:21
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☄ Helpfulby bg8780 2018/08/01 15:20:55
I would look back at buildzoid's PCB break down video of the Dark on Gamers Nexus youtube channel as I thought that part of the VRM is poweredby one plug ant the other half by the other. Just like you would not run a video card that has 2 PCIe connectors with just one.
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Sajin
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Re: X299 and Legacy PSU
2018/08/01 14:56:54
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☄ Helpfulby bg8780 2018/08/01 15:20:41
FYI the 7820x can pull 180w at stock...  A single 8-pin eps is rated at 235w. EVGA recommends two cables if using an i9 cpu. Looks at what the 7900x draws at stock in the picture above. With your overclock applied you may reach that 229.6w yourself, so using two cables would be a smart idea. 
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bg8780
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Re: X299 and Legacy PSU
2018/08/01 15:20:25
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Well crap. Looks like I may have to add a new PSU to the budget. This PSU is so damn great, I hate replacing it. I doubt there is a way to add a second CPU 8 pin to this PSU, PCI 8pin probably isn't wired the same correct?
For the record, I just ran Prime95 on this rig at 4.2ghz and my UPS is telling me I'm pulling 400w from the wall. The system idles around 230w. I guess I could always try running the X299 system with one 8pin and see what happens.
Saijin, if I do decide to get a new PSU, what is your personal recommendation for 850-1000w? I know Seasonic is great and they make a lot of EVGA's PSU's.
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Cool GTX
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Re: X299 and Legacy PSU
2018/08/01 16:02:18
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Correct, is Not wired the same Do Not use PCIe 8-pin or 6+2-pin for the CPU it lets the smoke out  X299 FTW manual says second CPU 8-pin is Optional Depends on your OC
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Sajin
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Re: X299 and Legacy PSU
2018/08/01 16:10:31
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bg8780
Well crap. Looks like I may have to add a new PSU to the budget. This PSU is so damn great, I hate replacing it. I doubt there is a way to add a second CPU 8 pin to this PSU, PCI 8pin probably isn't wired the same correct?
For the record, I just ran Prime95 on this rig at 4.2ghz and my UPS is telling me I'm pulling 400w from the wall. The system idles around 230w. I guess I could always try running the X299 system with one 8pin and see what happens.
Saijin, if I do decide to get a new PSU, what is your personal recommendation for 850-1000w? I know Seasonic is great and they make a lot of EVGA's PSU's.
I don't like using adpaters myself, but you could use this adapter to convert a pci-e cable to an eps. If you want to buy another psu I would go with a seasonic prime 850-1000w unit.
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bg8780
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Re: X299 and Legacy PSU
2018/08/01 16:22:55
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Sajin
bg8780
Well crap. Looks like I may have to add a new PSU to the budget. This PSU is so damn great, I hate replacing it. I doubt there is a way to add a second CPU 8 pin to this PSU, PCI 8pin probably isn't wired the same correct?
For the record, I just ran Prime95 on this rig at 4.2ghz and my UPS is telling me I'm pulling 400w from the wall. The system idles around 230w. I guess I could always try running the X299 system with one 8pin and see what happens.
Saijin, if I do decide to get a new PSU, what is your personal recommendation for 850-1000w? I know Seasonic is great and they make a lot of EVGA's PSU's.
I don't like using adpaters myself, but you could use this adapter to convert a pci-e cable to an eps. If you want to buy another psu I would go with a seasonic prime 850-1000w unit.
Prime Gold? I don't see going to Platinum being worth the extra $50
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Sajin
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Re: X299 and Legacy PSU
2018/08/01 17:18:31
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Yes, prime ultra gold is good.
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GGTV-Jon
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Re: X299 and Legacy PSU
2018/08/01 19:00:43
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I just watched a good portion of Buildziod's video on the Dark, could not find any information to back up my claim / thinking that both of the EPS plugs are required. Would have to hear from TiN_EE or someone from EVGA to clarify I had missed the part Sajin had posted about the X299 Dark manual saying that the i9 SkylakeX CPU required both Not that I doubted him but confirmed the part on the bottom of page 18 of the PDF. Since I am running an i9-7940x I had never looked into it and ran both of them thinking that the board strait our required both. bg8780 if you have not already done so I would recommend you download the PDF and look at the verbiage on that page I also recommend running your planned system specs through EVGA's PSU calculator - https://www.evga.com/power-meter/ just to get an idea as to what to shop for. Look at the upper end of what they recommend What are you going to run for a GPU? Pushing my 1080ti FTW3 on water I have seen it pull 200-300w, then you add the CPU and the rest of the system ...
post edited by GGTV-Jon - 2018/08/01 19:16:00
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bg8780
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Re: X299 and Legacy PSU
2018/08/01 20:08:31
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GGTV-Jon
I just watched a good portion of Buildziod's video on the Dark, could not find any information to back up my claim / thinking that both of the EPS plugs are required.
Would have to hear from TiN_EE or someone from EVGA to clarify
I had missed the part Sajin had posted about the X299 Dark manual saying that the i9 SkylakeX CPU required both
Not that I doubted him but confirmed the part on the bottom of page 18 of the PDF.
Since I am running an i9-7940x I had never looked into it and ran both of them thinking that the board strait our required both.
bg8780 if you have not already done so I would recommend you download the PDF and look at the verbiage on that page
I also recommend running your planned system specs through EVGA's PSU calculator - https://www.evga.com/power-meter/ just to get an idea as to what to shop for. Look at the upper end of what they recommend
What are you going to run for a GPU? Pushing my 1080ti FTW3 on water I have seen it pull 200-300w, then you add the CPU and the rest of the system ...
Same here. That's why I posted here. I couldn't find a straight answer. Everything just had wording that was vague and didn't mention hard requirements. I hope someone at EVGA can put this to rest. Gpu is a 1080 founders under a hybrid kit. If I get a new PSU I'll pick up a 1kw Seasonic Prime and call it a day. An 850w would still be plenty but I like the breathing room if I decide to go SLI or make a full loop down the road.
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