May I know what games your cousin is playing? Is it heavy or just minor?

Old HDD can be transferred to new PC.

Format the old HDD before transferring to new PC is always recommended to avoid conflict, especially if you are coming from a very aged OS to modern OS (legacy boot vs UEFI boot).

Intel Core i7 6700 - RM 1305
Gigabyte H170-HD3 (D4) - RM 446
Corsair 16GB (8GB x 2) DDR4 2133MHz Value RAM - RM 256
Zotac GTX750Ti 2GB GDDR5 Single Fan - RM 489
Kingston SSDNow UV400 240GB SSD - RM 249
Seasonic M12II EVO 520W - RM 335
Tecware Alpha - RM 189

Total: RM 3269 (ETech price inclusive of GST)

Not sure if you need another HDD since you are going to transfer from old PC.

WD Blue 1TB HDD - RM 215

An entry level dedicated GPU is included in the build list to enable smoother live preview playback in AI (need to enable in settings), I am not sure how much performance improvement the GTX750Ti can bring to your cousin since it is just slightly faster than the iGPU of 6700 (HD 530), the CUDA compute cores are pretty helpful in rendering though.

If you want to max out the budget, you can consider upgrading to a better GPU (GTX960 etc.) or jump straight to the upcoming i7 6800K (X99 platform).

The casing option is almost similar between Techview and ETech.

The main reason I choose Tecware Alpha is because of its price (< RM 200) and it comes with 2 front intake fans which can greatly improve the airflow, other casing within similar price range doesn't come with intake fan at all (or just 1).

TBH 6.5k budget for Dota 2 and Diablo is quite overkill

Why still spend so much for an obsoleted GTX970? You better off for GTX1070 since your budget can fit it.

Are you able to wait for few more weeks before building the rig? If yes then you will be able to board the latest RX 480 train, if cannot wait then you gonna settle with current gen hardware (soon to be last gen).

The card is said to be released by end of this month, stock availability here remains to be unknown but by judging at Nvidia's counterpart, the new GTX1080 is available in Malaysia on the first day of launch so I guess AMD should be able to do this as well.

You can buy the rest of the parts first without GPU if RX 480 isn't out on 25th Jun, if you wish to buy all the parts together then you gonna settle with either GTX960/GTX970/R9 380/R9 390.

If it is an office rig then you can go for Dell pr-built OEM PC, since you mentioned "gaming" in your purpose, you better go for custom rig instead, usually Dell's offering for 2.2k so-called "gaming" rig is quite disappointing.

You are looking for complete PC (including monitor/KB/mouse/speaker) or just the rig?

GTX1070 FE pre-order price is RM 2299 and will be available in mid of Jun/end of Jun.

Non-reference (AIB) cards are estimated to be slightly cheaper, around RM 2100+/-.

Your reply doesn't answer my question

I am asking if you are looking for complete set or just the rig.

Another question, which one is having higher priority, gaming or video editing?

If gaming then I will pump more money on GPU, if video editing then I will go for i7 instead.

Intel Core i3 6098P - RM 443
Asus H110M-K - RM 273
Corsair 8GB DDR4 2133MHz Value RAM - RM 128
Zotac GTX950 2GB GDDR5 Single Fan - RM 629
WD Blue 1TB HDD - RM 215
FSP Hexa+ 450W - RM 166
Armageddon T1x - RM 85
BenQ GW2270 - RM 379

Total: RM 2318 (ETech price inclusive of GST)

This is the build if you want to get all parts at one time.

Intel Core i5 6500 - RM 845
Gigabyte H170-HD3 (D4) - RM 446
Corsair 16GB (8GB x 2) DDR4 2133MHz Value RAM - RM 256
Sapphire R9 390 8GB GDDR5 Nitro - RM 1490
Kingston SSDNow UV400 120GB - RM 153
WD Blue 1TB HDD - RM 215
Seasonic M12II EVO 620W - RM 363
Tecware Alpha - RM 189

Total: RM 3957 (ETech price inclusive of GST)

If you want to wait for RX 480 then the build will be slightly different, this depends on the price of RX 480.

Price is changing almost everyday now due to unstable RM currency, ask here again when you are ready to buy the rig in the future for updated price and build.

G4400 is just en entry level processor, don't expect good performance on it, casual gaming is fine, but not CPU demanding one.

It can work with both Nvidia & AMD.

I don't recommend you to go with the obsoleted GTX970 anytime now, GTX1070 is pretty much in your hand already since your budget is healthy.

And you don't need SFX PSU for CM Elite 130, standard ATX PSU is fine, this helps to reduce the total cost.

If you would like to run games at higher settings, I suggest you to go for GTX960 instead of putting money on i5 + SSD.

If you really want to upgrade to i5 and SSD while keeping the GTX950, then you need at least RM 450+.

Intel Core i7 6700 - RM 1305
MSI B150M Pro-DH (D4) - RM 346
Corsair 8GB DDR4 2133MHz Value RAM - RM 128
MSI GTX970 4GB GDDR5 Tiger - RM 1373
Kingston SSDNow UV400 120GB - RM 153
WD Blue 1TB HDD - RM 215
Seasonic M12II EVO 620W - RM 363
Tecware Alpha - RM 189

Total: RM 4072 (ETech price inclusive of GST)

Open world games usually come with a huge map and lots of NPC/players, which means CPU will be the main factor, the G4400 will most likely to struggle at this type of games.

GTX750Ti/R7 370 is the border line for me if you want to use G4400, getting anything beyond them will most likely to create bottleneck.

Technically it should work, but if you are mixing different type of RAM (speed/latency/model), then there is always a chance that your mobo refuses to accept them.

Yes, more than enough.

Dual channel will still work (2 x 4GB + 2 x 8GB) because it works in pairs, just make sure you are install the same model in the correct slot (same color).

Getting similar type/model is always recommended.