Motherboard Power/Bandwidth Limit

Basically, I need to know if there is a power limit, motherboard limit, etc.

Motherboard: Optiplex 7010 MT 0GY6Y8

RAM: Corsair Vengeance Pro DDR3 1600 C9 4x8GB/2x8GB
- With 4 sticks of RAM installed: Performs below potential at 37%.
- With 2 sticks of RAM installed: Performs above potential at 60%.
(dual+ channel XMP is not supported by the motherboard)

SSD: Samsung 850 Evo 500GB
- With a normal boot of Windows 10: Performs below potential at 11%.
- With a safe mode boot of Windows 10 (With networking): Performs normally at 46%.

GPU 1: 1080 Ti (Supported)
- Tweaking all settings made no impact to performance. Removing the AMD card also had no impact on performance.

GPU 2: AMD HD 7750
- Tweaking all settings made no impact to performance. Removing the 1080 Ti card also had no impact on performance.

CPU: Intel Core i7-3770K
- Tweaking all settings made no impact to performance. Removing either GPU made no impact on performance. Safe mode had no impact on performance. Motherboard does not support overclocking for the i7-3770K processor.

PSU: ATX 1000W (70+ energy efficient)

- I know there's a lot of information here, but I didn't want to leave anything out. Two heads or more is definitely better than one, so please excuse excessive information if unnecessary.

- The SSD is the true component in question. The motherboard does have a SATA 3 port. The BIOS option for AHCI is enabled. Both the TRIM and SMART features for the SSD are enabled. The default windows cache is enabled for the drive, etc. There is about 400 GB free on my SSD, I only use it for light applications and boot. Everything else goes on the 6TB WD Black HDD I have.

- My PC isn't performing slowly or anything, I just don't understand why my SSD is getting such a low performance grade. You select and buy each part for your computer for maximum performance, and expect to get an around average score (a little lower or higher is fine) for the part in question.


Benchmark used to obtain score: http://www.userbenchmark.com/UserRun/8779188
 


I ran that specific benchmark and got the same results, with the SSD performing at 33% of it's potential. You may ask how I got this number? Task manager revealed that the SSD never went over 33% usage during the benchmark, showing that the drive is limited somehow. By windows perhaps?
 


Sorry screenshot on this site is a hassle, my SSD was at 240MB/s write and 200MB/s read (Sequential), until I turned off indexing (which I think a Windows Update turned back on for some reason.) After this, it went up to 500+ MB/s Write and about 400 MB/s Read, which I think is within the scope of the hardware. Thanks for your responses.
 

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