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New PSU for Dell T3500 ... 4 pin cpu cable, 8 pin socket
Hello,
A while back I was given a used Dell T3500 and it's been serving me well, and now recently ... someone also gave me a used GTX 580 (I have generous friends)... I immediately looked into the power requirements and found that the stock PSU was not going to cut it, so I went out and grabbed an "EVGA SuperNOVA 750 B 80 Plus".
Upon assembly i immediately found that even though the CPU cable starts as an 8 pin, it terminates in 2 x 4 pin ATX plugs while the mother board's CPU socket is 8 pin "EPS". I didn't do enough homework.
: S
There are adapters available from 4 pin ATX to 8 pin EPS, but is there a way I can be sure I don't destroy my motherboard or PSU by using one?
Thanks for any insight you can offer!
James O Strow
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November 21st, 2014 16:00
I actually went and looked at the stock PSU and read the specs and it started to make more sense. I was focused on the power of the 12v rails and didn't pay any attention to the 5 and 3.3 ones. Didn't realize I was in a "reality distortion" field.
It's frustrating because things used to be way easier when matching these things up, and I don't have the cash to buy another new one right now... so this machine will stand inert until after I return this PSU and get enough for an appropriate one. I don't want to trash all the components just to make it run underpowered for a month or so.
Anyway thanks and no thanks. I actually read some of your other posts and thought "hey maybe if I post here maybe this guy will help me out". You have done so, but you have also reminded of the no one gives a [Admin NOTE: Profanity removed as per TOU] how they make people feel on the web.
I won't be posting here again.
speedstep
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November 20th, 2014 12:00
EPS12V is required. There are no adapters. You will destroy ram, cpu, motherboard etc. Minimum required would be Corsair TX750 or Corsair CS750M. The power supply in the T5500 is 1100w.
speedstep
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November 21st, 2014 06:00
Yes EPS 12V and at least 750w power applies.EPS12V guarantees 40 amps on the 12V single rail as well as 130w for the 3.3V /5V RAIL with 25w ON 5VSB
Thats 480W on 12V +130w On 3.3V and 25w on 5VSB.
So bare minimum to run normally is 635W. If you add 2 6 pin PCI-E CONNECTORS that adds 150w for a total of 785w. If its 2 8 pin or worse 2 8 pin and 2 6 pin then you need 1100w.
If you look you will find threads of people using 450, 550, 650W ATX 2.3 POWER that DOES NOT TURN ON but rather flashes amber on the power button.
Too many base their choice of power supply on PRICE rather than performance and completely ignore the reality that the RATING on the power supply is TOTAL output. If you add up the rating on each rail it comes out to be more than the total.
James O Strow
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November 21st, 2014 06:00
Ok, it looks like I got lucky because my power supply has the below specs... looks like my decision to beat my video card's minumum requiments was a good one:
I actually also did some searching on what to do ... I read about the rails and plugging the two 4 pin plugs into the socket and reasoned that the draw should match the output. I still need to read more.
I was really skittish about this because 6 years back i had the opposite problem and didn't understand the electronics side of things very well. I plugged 8 pin into a 4 pin with an adapter. Smoked the motherboard.
Again, I appreciate the input (handholding) very much. You have helped me a great with understanding this stuff in the future.
James O Strow
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November 21st, 2014 06:00
Thanks for the reply... I'm talking about a T3500, not a T5500... does your assesment still stand?
speedstep
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November 21st, 2014 07:00
The 130W on the 5V/3.3V rail is minimum. Typical Dell 750W power supply for the precision allows for 150W on the 5V/3.3V rail. This is why EPS12V is required because that spec guarantees 130W min available on that rail and 25W minimum on the 5VSB rail. There is a lot of overstating then retracting even on the label. 5V @ 16A and 3.3V @ 30A = 179W but the max out is 150w.
12 x 16 = 192W
12 x 18 = 216W
12 x 18 = 216W
12 x 18 = 216W
OR 840W Total.
even if you go by the max combined outputs 700W +150w=850w
James O Strow
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November 21st, 2014 07:00
Well, I appreciate the clarification but not the tone. Typical crusty tech.
I will see my self out, looks like I have a new PSU to pick up.
speedstep
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November 21st, 2014 07:00
No you are unlucky because the 3.3V is 120w NOT 130W
and the 5VSB is 15W NOT 25W
You are ignoring the reality. 750w total with 748.8w = 1.2w FOR everything else.
If you add the max outputs 120 + 748.8 + 15 + 6 = 889.8 W which means reality distortion is going on.
Shirt
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March 31st, 2015 14:00
maheshnmurthi
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November 11th, 2015 20:00
Hi James,
I am also sort of stuck in a similar situation. I was wondering if your Supernova G2 was able to power your PC.
Thank you
speedstep
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November 12th, 2015 05:00
EPS PFC spec power supply is what is needed. EPS is 24 pin and 8 pin ATX is 20 pin 4 pin. The 525W supply says this.
EPS12V Spec
maheshnmurthi
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November 12th, 2015 08:00
Thanks a lot SpeedStep. Can you recommend any non-Dell PSUs that adhere to these specs? I could not find any on the market that does.
Thanks
maheshnmurthi
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November 12th, 2015 08:00
Thanks SpeedStep. Can you recommend any non-Dell PSUs that adhere to these specs? Most of the PSUs that say they are EPS12V compatible do not follow the specifications completely.
Thanks
speedstep
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November 12th, 2015 09:00
CS750M is bare minimum recommended for Spec and dimensions.
http://www.corsair.com/en-us/cs-series-modular-cs750m-750-watt-80-plus-gold-certified-psu
The latest ATX12V v2.4 and EPS 2.92 standards and it is
backward compatible with ATX12V 2.2, 2.31 and ATX12V 2.01 systems. 4th generation Intel® Core™ processor Ready (Intel Haswell and Z87 motherboards) 80PLUS Gold certified, delivering over 90% energy efficiency at real world load conditions
Modular cables allow you to remove unneeded cables.
Active Power Factor Correction (PFC) with PF value of 0.99.
Universal AC input from 100~240V
Over-voltage protection, under-voltage protection, and short circuit protection, over power protection, over temperature protection provide maximum safety to your critical system components
Safety and Agency Approvals: FCC, ICES, UL, CUL, TUV, CCC, CE, RCM, CB, EAC, KC, BSMI, ROHS, WEEE
maheshnmurthi
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November 12th, 2015 09:00
Hi SpeedStep,
CS 750M still does not provide 4A on 5VSB and according to the EPS12V Spec, it should be able to provide a max of 30 A on 5V. It only gives 25A, further more no more than 130 W on 3.3V and 5V together - 170 W is recommended according to 2.92 standards.
Also, could you tell me what are the components that are typically powered by 3.3v, 5v and 5vSB?
Thanks!