can noctua nh-d15 fit in to corsair 400r? anyone try before?

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)

What you could do is get the rest of the components which your budgets allows and use the processors iGPU for the time being as the next generation of cards will be dropping sometime soon in about 4 months based on speculation. That way you won't be salty when you realise a new card has been released in the same price bracket performs if not better.

I want to upgrade my rig. But im not sure other amd processor that can fit into my current MB (GIGABYTE 970a-DS3P).

My rig details:
Processor - AMD FX-6300
GPU - GeForce GTX650 1gb DDR5
RAM - 8gb 1600mhz
PSU - 450watts

And what could i do more to improve my game graphic to the max for DOTA2? Now i can only make it into 50% of full graphics only. And when i do to max, my fps drops until <50%

Thanks for your replies. Cheers! ✌🏻️

just would like to give a token of gratitude to terence_nwb, st4Lk3rz and etech team

Thanks terence and st4Lk3rz for your suggestion and advice

and thank etech team for your professionalism for handling some hiccup when i came to collect the rig , very satisfied with your service

received my rig yesterday with the following spec 
I7 6700
Gigabyte b150m-d3h (d4)
Corsair 16gb (8gb x 2) d4 2133mhz value ram
Sapphire r9 390 8gb nitro
Fury 120gb ssd
1tb wd blue
Tp-link tl-wn881nd (2.4ghz)
Seasonic s12ii 620w
Tecware alpha white
k120 keyboard

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 

But what if i wanted to max graphics in Farcry, CODas well. Is it just need to upgrade my gpu only? I dont know much in IT hardwares. Even i dont know why some are old processors but if got high cores its much expensives than the latest one. -.-

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?

Im already prepared for the cost. But the problem is, whats the best CPU that can fit my MOBo? Because i just recently changed my mobo since my CPU still work fine.

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 

Ouch! So if im going to upgrade the best amd cpu,gpu which 1 your recommend build? Because i dont have much money to spend into i5/i7 rig. I heard that amd is much cheaper to compare with intel and can get almost the same speed and everything

They aren't equal in terms of performance even they (Intel vs AMD) have same speed/core.

FX (Bulldozer) series CPU is using modules with 2 integer cores in each modules as "core", it is excel in those software/games which make use of it, but a dual core i3 can beat the highest end of FX series CPU in game if the game is operating in single threaded way.

Your CPU is ok for modern gaming, just upgrade the GPU and PSU for the time being.

AMD R9 390 and a decent 600W PSU will cost you around 2k+/-.

Recently i just purchased NZXT H440 Case and realized this case has limited air flow systems , few questions to ask :
1. Which CPU cooler is best for i5-6600 Processor with this case? with best air flow systems possible. (Budget below RM 800, No water cooling)
2. In H440 Casing, Which Air flow setup is more suitable?

Front and bottom as intake while rear and top as exhaust.

RM 800 can get high end AIO water cooler already, if you are going for air cooler, no need RM 800.

i5 6600 is a locked CPU (or did you use the Skylake non-K exploit to oc it?), any sub-RM 200+/- air cooler will do the cooling job just fine like CM Hyper 212X or Cryorig H7 or H5 Ultimate.

If High End AIO Water Cooler what will you suggest ?
And any really big difference compared to air cooled with this CPU?

Difference is quite significant, I tested i5 4460 few months ago with Corsair Hydro H100i and CM Hyper 212X.

H100i is able to keep the CPU < 40°C all the time when during max load compared to 212X's ~55°C, 55°C is still a very good reading though considering the weather in Malaysia is so hot.

If you are willing to spend so much just to get the extra ~15°C, then go for H100i V2 for 240L, H115/NZXT Kraken X61 for 280L, the rig looks nicer too with AIO liquid cooler 

Guess ill go for NZXT Kraken X61. Best to put on top or front ? Best with Pull right?