First one is case, you can choose whatever case you want, it is just a recommendation.

Second one is motherboard.

Since your graphics card costs only RM 300+ so normal 400W PSU will do, but it cannot guarantee a smooth frame rate and gameplay when playing Dota 2. The i3 processor will run fine, you don't need i5 to play Dota 2.

Intel Core i3 4130 - RM 419
Asrock H81M-VG4 - RM 189
Kingston 4GB DDR3 1600MHz Value RAM - RM 129
Antec VP400 PSU - RM 119
Toshiba 500GB HDD - RM 174
Thermaltake Versa H25 - RM 139

Total: RM 1169 (Viewnet price inclusive of GST)

You can add another RM 25 to upgrade the HDD to 1TB and RM 105 for 8GB RAM

Yes, you can use i7 4790k on that mobo but it will be a waste since the mobo cannot oc your processor, you need Z series mobo to unleash the full potential of i7 4790k such as Gigabyte Z97X Gaming 3/5/7, Asus Z97 PRO Gamer etc.

Kingston Value RAM is cheap and has better price and performance ratio, getting a high performance RAM won't help you much in real world usage unless you are doing benchmark on it which it will give you better score, so if you want to save some money, go for Kingston one.

Asrock B85M-HDS got 3 fan connectors according to official website, 1 CPU, 1 Chassis and 1 Power.

Dell U2515H is currently priced RM 1479.

For sound card, you can try looking for Asus Xonar series.

Which part to get first, I think don't get the processor and mobo first since 5th gen Broadwell CPU is coming out soon, if the price of 5th gen is the same with current 4th gen then you can just go for newest 5th gen.

Asrock B85 Pro4 with 5 fans connectors at RM 339 or you can just use molex cable which is very cheap to connect your fan directly to PSU when you run out of slot on your mobo if the fan is just 3 pin (non-pwm type fan).

As for part, starting with PSU, SSD, HDD and monitor is a good choice.

Of course can, even 4K @60Hz is also supported using DP v1.2 cable

i7 comes with iGPU and it can support up to 4K resolution so a discrete GPU is not needed unless you use it to play games.

If you do rendering a lot then go for i7 4790K and pair it with a Z mobo, as for mobo choice, you can look for review on the Internet and get the one which suits you more.

Gainward GTX970 is the cheapest GTX970 you can get in Malaysia, that's why most of the people will go for it instead of picking up an expensive GTX970 which doesn't really boost a lot of performance. EVGA do not have official distributor in Malaysia yet, you can only get it overseas.

Xeon E3 1231 V3 supports hyperthreading and most of the rendering software will take advantage of it to render and finish the task faster, it will smoke the i5 which does not support hyperthreading. But a highly overclocked i5 4690k will also fasten up the rendering process too.

Since Xeon is locked, a normal B85 or H97 mobo will do the job, Asrock has the best price and performance ratio, if you wish to upgrade to Broadwell processor, choose H97 mobo.

Intel + Nvidia build
Intel Xeon E3 1231 V3 - RM 979
Gigabyte Z97X-SLI - RM 559
Kingston 8GB DDR3 1600MHz Value RAM - RM 234
Leadtek GTX 980 4GB GDDR5 GPU - RM 2179
Seasonic M12II EVO 750W PSU - RM 459
Liteon 900S 128GB SSD - RM 249
WD Blue 1TB HDD - RM 199
Thermaltake Versa H25 Chassis - RM 139

Total: RM 4997 (Viewnet price inclusive of GST)

Intel + AMD build
Intel Xeon E3 1231 V3 - RM 979
Asrock B85 Fatal!ty Killer (CF ready) - RM 369
Kingston 8GB DDR3 1600MHz Value RAM - RM 234
Sapphire R9 290X 4GB GDDR5 TRI-X OC GPU - RM 1549
CM V1000 PSU - RM 799
Kingston V300 480GB SSD - RM 749
WD Blue 1TB HDD - RM 199
Thermaltake Versa H25 Chassis - RM 139

Total: RM 5017 (Viewnet price inclusive of GST)

First build cannot fit a 500GB SSD due to over budget while second build can fit but Kingston V300 SSD is using cheap NAND which lowers the performance but if you insist to get 500GB SSD within your budget then Kingston is the only choice.

Not sure if already have a monitor or not but getting a 1080p 120/144Hz monitor will definitely make your rig not SLI/CF ready as requested.

And about the color, both GPUs are not red and black in color, choosing Asus and MSI GPU will increase your budget.
Intel Core i5 4460 - RM 719
Asrock H81M-VG4 - RM 189
Kingston 8GB DDR3-1600 x1 - RM 234
Sapphire R7 265 2GB DDR5 Dual-X - RM 589
Toshiba 500GB hard disk - RM 179
Antec VP500 power supply - RM 159
Additional 12cm fan - RM 25
Thermaltake Versa H23 case - RM 135

Total: RM 2229 (Viewnet price inclusive of GST)

Didn't notice that

Refinement to Intel + AMD build
Intel Xeon E3 1231 V3 - RM 979
Gigabyte Z97X-SLI - RM 559
Kingston 8GB DDR3 1600MHz Value RAM - RM 234
MSI R9 290X 4GB GDDR5 Lightning GPU - RM 1379
CM V1000 PSU - RM 799
Kingston V300 480GB SSD - RM 749
WD Blue 1TB HDD - RM 199
Thermaltake Versa H25 Chassis - RM 139

Total: RM 5037 (Viewnet price inclusive of GST)

He want a CF ready build

If GTX980 SLI then 750W PSU is enough but if he go for R9 290X CF, 1000W is recommended since one R9 290X requires 750W PSU already as stated in the specs sheet.

As for casing, if the airflow is good, CF/SLI setup should not be a problem with H25 but if I got extra budget, I will go for better case too

Nope, don't get AMD processor, Intel beats it in all aspects.

Intel Core i5 4460 - RM 719
Asrock B85M-HDS - RM 264
Kingston 8GB DDR3 1600MHz Value RAM - RM 234
Leadtek GTX970 4GB GDDR5 GPU - RM 1179
Seasonic M12II Evo 520W PSU - RM 299
WD Blue 1TB HDD - RM 199
Thermaltake Versa H25 - RM 139

Total: RM 3033 (GPU is from Techview, others are from Viewnet inclusive of GST)

3K budget is not easy to squeeze in an SSD unless you are willing to sacrifice your budget on GPU. Change GPU to Leadtek GTX960 2GB GDDR5 @RM 819 and add in Liteon S900 128GB SSD @RM 249 if you wish to do so.

16GB RAM is quite overkill for just gaming.

Intel Core i5 4460 - RM 719
Asrock B85M-HDS - RM 264
Kingston 8GB DDR3 1600MHz Value RAM x2 - RM 468
WD Blue 1TB HDD - RM 199
Seasonic M12II Evo 520W PSU - RM 299

Total: RM 1949 (Viewnet price inclusive of GST)

If you go for 8GB RAM then the following build is better.

Intel Xeon E3 1231 V3 - RM 979
Asrock B85M-HDS - RM 264
Kingston 8GB DDR3 1600MHz Value RAM - RM 234
WD Blue 1TB HDD - RM 199
Seasonic M12II Evo 520W PSU - RM 299

Total: RM 1975 (Viewnet price inclusive of GST)

Look for hardware to be reuse

My opinion is go for a better case, it is more worth in the long run.

Intel Core i5 4460 - RM 719
Asrock B85M-HDS - RM 264
Kingston 8GB DDR3 1600MHz Value RAM - RM 234
Seasonic M12 II EVO 520W PSU - RM 299
WD Blue 1TB HDD - RM 199
Thermaltake Versa H25 - RM 139

Total: RM 1854 (Viewnet price inclusive of GST)

If you can accept slightly over budget, switch the processor to Intel Xeon E3 1231 V3 @RM 979 which is more future proof or spend the remaining budget in getting a better chassis to suit your need.

Lets pray he can find one, it is really hard to find the leftover of them now

How much is the old rig? If pricing too close to new rig, better build a new rig for new warranty and hardware.

RM900 is ok for that, it is hard to build new rig just for Dota 2 below 1k now. The processor and GPU should work with Dota 2.

It's GTX750