Suggest improvements to this quiet PC build

Case: Define R4 Midi Tower Case - Titanium Grey £72.95
PSU: 520w FANLESS '80 Plus Platinum' Modular Power Supply £124.99
CPU: Core i5-6600K 3.9GHz (Skylake) Socket LGA1151 Processor - OEM £191.99
Heatsink: be Quet! Dark Rock Pro 3 CPU Cooler £65.99
Mobo: GA-Z170X-Gaming 3 Intel Z170 (Socket 1151) DDR4 ATX Motherboard £124.99
RAM: Ballistix Sport LT 32GB (4x8GB) DDR4 PC4-19200C16 2400MHz Quad Channel Kit - White (BLS4C8G4 £155.99
GPU: Gigabyte GeForce GTX 750Ti 2048MB GDDR5 PCI-Express Graphics Card (GV-N75TD5-2GI) £89.99
Soun: Creative Labs Creative Sound Blaster Z High Performance Gaming Sound Card - OEM (30SB150200000) £44.99
PCIE ssd: Samsung SM951 512GB M.2 PCI-e 3.0 x 4 NVMe Solid State Drive (MZVPV512HDGL-00000) £221.99
SATA ssd: Samsung 1.0TB 850 EVO SSD 2.5" SATA 6Gbps 32 Layer 3D V-NAND Solid State Drive (MZ-75E1T0B/EU) £259.99

£1353.86

I'm looking to keep this as quiet as possible. This is why I chose an average graphics card as I heard these ones were fairly quiet. Anyone have thoughts on the heatsink? Does everything fit?

Rig will be used for office work, video editing (not 4k), music production, mild gaming.

The gtx 960's run quiet as well it will give you a lot more gaming performance.

http://techreport.com/review/27806/five-geforce-gtx-960-cards-overclocked

The heatsink fits should have around 7mm clearance. TBH I'm not sure how the stock fans on it are so you might want to do some research and see how loud they are and maybe replace them.

As Micky said 960's are fairly quiet cards and will give you a boost in performance.

Snookums said:

The heatsink fits should have around 7mm clearance. TBH I'm not sure how the stock fans on it are so you might want to do some research and see how loud they are and maybe replace them.

As Micky said 960's are fairly quiet cards and will give you a boost in performance.

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You mean the fans on the heatsink or the case?

Both

You could also consider the Scythe Kotetsu or the Scythe Ninja 4 if you need or want a smaller heatsink.

Also maybe consider one of the asus z170 boards as they have very good bios settings and software to control fan speeds. I'm not sure how good the fan control settings are on the gigabtye boards.

Lastly any reason for the R4 over the R5?

Also not sure if you were getting the i5 6600k to overclock but as it looks like your not really trying to budget on your system maybe consider a i7 6700 which will be better for your video editing and audio production.

Watercooling.

Sith uk i disagree about the watercooling unless its a custom set up not a pre built one as they have very noticeable pump noise i would say make sure you have some fans in the front of the case the better the airflow the less your components will have to spin their fans up.

Plexman said:

Also not sure if you were getting the i5 6600k to overclock but as it looks like your not really trying to budget on your system maybe consider a i7 6700 which will be better for your video editing and audio production.

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I had heard those run a lot hotter and would cause more noise, no?

Plexman said:

You could also consider the Scythe Kotetsu or the Scythe Ninja 4 if you need or want a smaller heatsink.

Also maybe consider one of the asus z170 boards as they have very good bios settings and software to control fan speeds. I'm not sure how good the fan control settings are on the gigabtye boards.

Lastly any reason for the R4 over the R5?

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Isn't the R5 for watercooling?

CryptKeeper said:

I had heard those run a lot hotter and would cause more noise, no?

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Well the i5 6600k has a TDP of 91w where as the i7 6700 has a lower TDP of 65w so should run a little cooler and maybe allow you to run your fan's slower while keeping good temperatures. If your not going to overclock then maybe even a i5 6600 non k may be an option as it also has a TDP of 65w.

CryptKeeper said:

Isn't the R5 for watercooling?

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The R5 is just the updated and improved version of the R4. I would go for the R5.