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14 Posts

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January 27th, 2024 19:25

Upgrading a Dell Precision 3630 power supply to anhigher capacity

I know theres another post about on how the 3.3v/5v rail should be able to output more then 142w , but i have been thinking about using a corsair cx 750, but it has a 130w 3.3v/5v output. What could be the risks to skimp out the 3.3v/5v rail. (My model does not have a dvd rw)

TIA :)

5 Practitioner

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5.5K Posts

January 28th, 2024 15:41

Using cultists tier list for reference is very good.  On the technical side, I can tell you that the wattages numbers are good, it meets the power needs and will work with your system configurations.  On the performance side, the CX quality is an entry level, budget class.  The main concern is how well it will handle the voltage spikes and overcurrent when the protection suite kicks in.  That, should be your decision making. 

But, with the budget constraint, it's an acceptable choice and still beats those of budget brands.  

5 Practitioner

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5.5K Posts

January 27th, 2024 21:17

It really depends on the system components that drawn power from those rails.  Use power supply calculator to get a better estimate and select a suitable PSU for your needs.  A suggested number was thrown out there but not everyone would having the same usages, especially with peripherals and USB gadgets.

1 Rookie

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January 27th, 2024 21:50

My total load wattage is around 440-500 (i5-9500 + rx 5700 xt) my weak 460w psu can't handle them and black screens my gpu and after that refuses to post and only gets the fans on, i settled that a 750w psu is the perfect fit but i can't find a reasonably priced one with a capable 3.3v/5v rail (>142w), a safe bet should be the corsair rm series but the rm750 is out of my budget in my country, and i could only afford the rm650, but i don't fell that 12w difference from dell psus 3.3/5v (142w) rail should be a huge problematic factor, i need a more professional opinion on this...

Read this thread to better understand my concern: https://www.dell.com/community/en/conversations/precision-fixed-workstations/upgrade-psu-from-460w-to-850w-in-precision-3630/647f8bb2f4ccf8a8debd6106

5 Practitioner

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5.5K Posts

January 28th, 2024 10:44

Dell power supplies have very decent quality and when you decide to upgrade, don't skimp out on the quality as well.  Most of the good quality aftermarket PSU with 750w - 850w could provide around 120w of 3.3v/5v rails while some cheaply made PSU might boast of 140w or more of those rails.  It does not mean that those cheap PSU are better.

When stating the total watts, one must know the estimate of the 3.3v/5v rails the machine needs.  Without a list of your components usages, then the suggestion can only be based on the quality.  For the average configuration of a 3630, your choice of CX750 is considered an upgrade over the OEM wattages and should be sufficient in power, but can't speak for the quality.  It's not wise to throw away a platinum PSU for a white label category or a bronze class.

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14 Posts

January 28th, 2024 14:54

My Dell OEM PSU is 460w 80+Gold, the CX750 (gray label/CP-9020279-EU) is a+80 bronze that acts like a +80 silver. Corsair is generally a good psu brand, and cx-m series are a tier b (internet cultists tier list), and the cv series (considered to be worse than the cx series)is tier C, so i find the cx series the most suiting, i need a confirmation if this is a viable choice

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14 Posts

January 28th, 2024 16:00

Thanks i will take your advice in consideration

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14 Posts

February 9th, 2024 18:04

Final update: i went with a RM750, and i do not look back at all

5 Practitioner

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5.5K Posts

February 9th, 2024 22:39

A good choice and worth of investment.  One of Channel Well Technology performance line.

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