You cannot use Skylake Xeon CPU on H170 chipset mobo, you need C232 WS mobo for that.

As for RAM, no point getting > 2133MHz RAM when you aren't using Z170 mobo, speed will be limited to 2133MHz even if you get 2666MHz, can save some money here.

I don't know where you get the price from because your price is quite different from what I get from ETech's lelong account

Intel Core i7 6700 - RM 1284
Gigabyte H170-HD3 (D4) - RM 486
Corsair 16GB (8GB x 2) DDR4 2133MHz Value RAM - RM 324
Gigabyte GTX980Ti 6GB GDDR5 Xtreme Gaming - RM 3300
Kingston HyperX Fury 120GB SSD - RM 209
WD Blue 1TB HDD - RM 215
CM V650 - RM 498
NZXT Noctis 450 - RM 605
Acer Predator XB271HU-IPS - RM 3299
Corsair Strafe RGB - RM 582

Total: RM 10532 (ETech price inclusive of GST)

CPU cooler is optional since it is not an overclockable rig, you can spend money on it if you want, but don't spend RM 469 on Kraken X41, it is just a 1 x 120mm AIO liquid cooler which is not worth, top up a bit for Corsair Hydro H100i for 2 x 120mm instead.

If you want to keep using the Xeon, there are only few options you can make, Gigabyte X150-Plus, ASRock E3V5 etc.

Gigabyte X150-Plus is the cheapest C232 chipset you can get from ETech now, but you are warned Xeon E3 doesn't have iGPU which means if your GPU is faulty, you need a replacement GPU for display output, last time many people went for Xeon during Haswell era because the price of getting a Xeon (4C8T) CPU + mobo combo is cheaper than getting an i7 since it can be used on lower end chipset mobo, but since the situation has changed in Skylake, Xeon build isn't worth to get anymore, i7 + B150/H170 is more budget friendly now.

There are many GTX980Ti out there, the reason why I picked Gigabyte is because of its price and the clock speed, why people say Zotac Extreme is the fastest GTX980Ti out there? It is because of the factory overclocked speed is the highest among all the GTX980Ti out there, Gigabyte Xtreme's factory clocked speed is 1342MHz vs Zotac's 1355MHz, it is just 13MHz difference but you have to pay nearly RM 300 more for it (bad good price/performance ratio), you can manually overclock it to match what other cards are offering by using MSI Afterburner software, Zotac products come with 5 years of warranty though.

Understood, different people have different personal preferences

You can consider Samsung 850 EVO 250GB, Kingston HyperX Fury 240GB, Corsair Force LE 240GB etc.

Performance difference is not huge between them, any SSD in the market is fast enough for normal consumers to feel the difference if they are coming from HDD, so either one is fine, Kingston and Corsair one are much cheaper (they are below RM 400, perfect for money saving).

If you own a K series CPU and are going to overclock it, then yes it is recommended to get aftermarket CPU cooler.

For non-overclockable rig, stock cooler runs just fine, you still can get a decent 3rd party CPU cooler to further improve the heat dissipation rate and have slightly reduced noise level.

RM 600 can get you a BenQ GW2470 or top up a bit for AOC i2369VM IPS or Dell S2316H IPS.

Please share your casing model, I need to know the max clearance/CPU height support of your casing.

CM TX3 EVO or Cryorig H7, the former is cheaper.

Sure

Same mobo may tolerate it, some will have to undervolt to work, some won't work at all.

The best would be buying the exact same model of RAM.

Intel Core i7 6700 - RM 1284
Gigabyte H170-HD3 (D4) - RM 486
Corsair 32GB (8GB x 4) DDR4 2133MHz Value RAM - RM 648
Asus GTX960 4GB GDDR5 Turbo - RM 927
Kingston HyperX Fury 120GB SSD - RM 209
WD Blue 1TB HDD - RM 215
Seasonic S12II 620W - RM 309
Tecware Alpha Black - RM 219
Dell P2415Q UHD - RM 1859

Total: RM 6156 (ETech price inclusive of GST)

Intel Core i5 6500 - RM 837
Gigabyte B150M-D3H (D4) - RM 403
Corsair 8GB DDR4 2133MHz Value RAM - RM 162
Sapphire R9 390 8GB GDDR5 Nitro - RM 1549
Seasonic S12II 620W - RM 303
Tecware Alpha Black - RM 219

Total: RM 3473 (ETech price inclusive of GST)

If you want SSD to be included, let me know I will adjust the build accordingly.

Congrats on your new build, RM 400 can get Seasonic M12II EVO 520W or 620W (more upgrade room).

It is PITA to do cable management with non-modular PSU in ITX build

Just get a WiFi adapter to connect to WiFi.

TP-LINK TL-WN881ND, around RM 60.

I tried to use Xeon and high speed RAM but your budget is holding back you from getting them

TBH GTX980 isn't worth to get anymore with its current market price, better top up a bit for GTX980Ti or swap to the stronger R9 390X/Fury.

Intel Core i7 6700 - RM 1284
Gigabyte H170-HD3 (D4) - RM 486
Corsair 8GB DDR4 2133MHz Value RAM - RM 162
Palit GTX980 4GB GDDR5 Jetstream - RM 2389
Kingston HyperX Fury 120GB SSD - RM 209
WD Blue 1TB HDD - RM 215
Seasonic M12II EVO 620W - RM 363
Tecware Alpha Black - RM 219
BenQ GW2470H - RM 589
Logitech MK200 Wired Combo - RM 63

Total: RM 5979 (ETech price inclusive of GST)

Optional upgrade/build:
1. Sapphire R9 390X 8GB GDDR5 Tri-X OC - RM 1945
2. Palit GTX980Ti 6GB GDDR5 Super Jetstream - RM 3109 (Require top up)

Not all software will use GPU as hardware accelerator FYI, some of them use GPU VRAM to store image/video data while some of them don't use at all during rendering.

The difference between 5820K and 5930K is just the max PCI-E lanes supported increased to 40 in 5930K which is required for 3/4-way SLI/CF setup (or when you need more PCI-E x16/x8 slots), this is not useful in your case, you can also overclock the 5820K to match what 5930K is offering manually, they both are hexa core CPU.

Intel Core i7 5820K - RM 1680
MSI X99A Raider - RM 940
Corsair Vengeance LPX 32GB (8GB x 4) DDR4 3000MHz RAM - RM 1260
Zotac GTX980Ti 6GB GDDR5 AMP! - RM 2999
Kingston HyperX Fury 120GB SSD - RM 229
WD Blue 1TB HDD - RM 225
CM V750 - RM 559
Corsair Hydro H100i V2 - RM 508
Tecware Alpha White - RM 199
Dell P2415Q UHD - RM 1930

Total: RM 10529 (Techview price inclusive of GST)

According to spec sheet, 400R can support CPU cooler height up to 175mm while Noctua NH-D15 max height with fans installed is just 165mm, so theoretically they are compatible with each other.

If you play Dota 2 only then no need to upgrade the processor, invest in GPU instead.

Get a GTX750Ti (around RM 500+) then you can get max settings 1080p60 easily

No problem, enjoy your lovely rig

Running max graphics setting in those games listed requires high end GPU and a capable CPU, this will cost you a lot, so prepare your wallet for it

So what's your budget for the upgrade?

FYI AM3+ socket is dead, the highest end CPU your mobo can support is FX8370, which I don't recommend you to upgrade from your current FX6300, better wait for new Zen FX CPU which is going to be released later this year.

New GPU from Nvidia and AMD is also coming soon, if you can wait, I suggest you to wait, if not later when you find out you are actually paying the same price as the upcoming products but with weaker performance, you gonna