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RM750x (2018) or RM850x (2018)

Marfe
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I'm planning to upgrade my PSU and need a suggestion which to get. Here in Japan the price difference of RM750x and RM850x is like $3 and I don't know which one to get.

 

I want to ask because I want to know which of the two is more efficient. I watched some videos and read some posts that there is an efficiency curve thing.

 

This is full spec of my rig

 

CPU: Ryzen 5 1600 @ 3.8Ghz

Motherboard: MSI B350M Bazooka

GPU: MSI RTX 2070 Gaming Z

Ram: Corsair LPX 2x8GB 3000mhz DDR4

PSU: Antec Neo Eco 650W 80+ Bronze

Storage:

• Samsung 850 Evo 250GB (Boot Drive)

• Samsung 860 Evo 500GB (Steam Library)

• Western Digital Blue 1TB (Anything Library)

Cooling: NZXT X72

Case: MasterBox 5 White (Mesh)

CPU: Ryzen 5 1600, Ryzen 5 3600

Motherboard: MSI B350M Bazooka, ASUS X570 Tuf Gaming-Plus

GPU: MSI GTX 1060 3GB Aero ITX OC, MSI RTX 2070 Gaming Z

Ram: Corsair LPX 2x8GB 3000mhz DDR4

PSU: Antec Neo Eco 650W 80+ Bronze, Corsair RM750x

Storage:

• Samsung 850 Evo 250GB (Boot Drive)

• Samsung 860 Evo 500GB (Steam Library)

• Western Digital Blue 1TB (Anything Library)

Cooling: Hyper 212X, NZXT X72

Case: Silencio 352, MasterBox 5 White (Mesh)

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Out of those two you might as well get the 850x for a better resell value in the future

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CPU: R5 3600 || GPU: RTX 3070|| Memory: 32GB @ 3200 || Cooler: Scythe Big Shuriken || PSU: 650W EVGA GM || Case: NR200P

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Just now, Comic_Sans_MS said:

You do not need a 750W PSU. A nice 550W PSU is easily enough. A 550W RMx should be fine, yeah.

But i'm also planning to upgrade my CPU to a Ryzen 7 when the 3rd gen Ryzen CPUs are released

CPU: Ryzen 5 1600, Ryzen 5 3600

Motherboard: MSI B350M Bazooka, ASUS X570 Tuf Gaming-Plus

GPU: MSI GTX 1060 3GB Aero ITX OC, MSI RTX 2070 Gaming Z

Ram: Corsair LPX 2x8GB 3000mhz DDR4

PSU: Antec Neo Eco 650W 80+ Bronze, Corsair RM750x

Storage:

• Samsung 850 Evo 250GB (Boot Drive)

• Samsung 860 Evo 500GB (Steam Library)

• Western Digital Blue 1TB (Anything Library)

Cooling: Hyper 212X, NZXT X72

Case: Silencio 352, MasterBox 5 White (Mesh)

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How much for the RM550x? Your system will use less than 300W under load. You really don't need a 750W let alone an 850W.

 

22 minutes ago, Marfe said:

I want to ask because I want to know which of the two is more efficient. I watched some videos and read some posts that there is an efficiency curve thing.

There's pretty much no difference between the 850 and 750 in regards to efficiency.

image.png.4f39f4a2cfd3f0e885a2311e1dc8f12f.pngimage.png.96687d2160eb7d86ffe8faedcc3bb17b.png

 

 

However, if you want the RMx with the best efficiency, for your system the RM550x would be marginally better in terms of efficiency as the 550 is more efficient at the low range (<150W) than the 750/850 units, which is where your system is going to be most of the time under typical use case.

image.png.81114ca91ff77320d14f58ebacf6ffc4.png

 

Though really we're talking very small differences that won't make any noticeable impact to your power bill. They're all really efficient units.

CPU: Intel i7 6700k  | Motherboard: Gigabyte Z170x Gaming 5 | RAM: 2x16GB 3000MHz Corsair Vengeance LPX | GPU: Gigabyte Aorus GTX 1080ti | PSU: Corsair RM750x (2018) | Case: BeQuiet SilentBase 800 | Cooler: Arctic Freezer 34 eSports | SSD: Samsung 970 Evo 500GB + Samsung 840 500GB + Crucial MX500 2TB | Monitor: Acer Predator XB271HU + Samsung BX2450

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Just now, Spotty said:

How much for the RM550x? Your system will use less than 300W under load. You really don't need a 750W let alone an 850W.

Price converted using XE Currency. All of the prices are from Amazon Japan

 

RM850x (2018) = ¥ 14,527 ($129)
RM750x (2018) = ¥ 14,211 ($125.5)
RM650x (2018) = ¥ 12,163 ($107.4)
RM550x (2018) = ¥ 11,453 ($101.2)
 

Edit: I'm also planning to upgrade my CPU to a Ryzen 7 when the 3rd gen Ryzen chips are released.

CPU: Ryzen 5 1600, Ryzen 5 3600

Motherboard: MSI B350M Bazooka, ASUS X570 Tuf Gaming-Plus

GPU: MSI GTX 1060 3GB Aero ITX OC, MSI RTX 2070 Gaming Z

Ram: Corsair LPX 2x8GB 3000mhz DDR4

PSU: Antec Neo Eco 650W 80+ Bronze, Corsair RM750x

Storage:

• Samsung 850 Evo 250GB (Boot Drive)

• Samsung 860 Evo 500GB (Steam Library)

• Western Digital Blue 1TB (Anything Library)

Cooling: Hyper 212X, NZXT X72

Case: Silencio 352, MasterBox 5 White (Mesh)

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35 minutes ago, Marfe said:

Price converted using XE Currency. All of the prices are from Amazon Japan

 

RM850x (2018) = ¥ 14,527 ($129)
RM750x (2018) = ¥ 14,211 ($125.5)
RM650x (2018) = ¥ 12,163 ($107.4)
RM550x (2018) = ¥ 11,453 ($101.2)
 

Edit: I'm also planning to upgrade my CPU to a Ryzen 7 when the 3rd gen Ryzen chips are released.

Based off those prices, I'd get the RM650x.

Dell S2721DGF - RTX 3070 XC3 - i5 12600K

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550W is fine, even with a Ryzen 7 OC upgrade.

650W if you plan to upgrade to a top end overclocked GPU.

No need for anything higher unless you intend to SLI/Crossfire

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