i clean the stock cooler before and it is still very loud. I dont know why. If i want to upgrade my CPU how much do i need ? Upgrading CPU means changing the mother board ?

To solve the noise issue, get a new CPU cooler, no need to change entirely.

If you want to change CPU, yes you need to change mobo also.

Rig based on < 2K, this spec can run games at low/med settings, but please take note some games won't run on dual core i3 like Far Cry 4, if there are more games to follow this trend then you might need to consider upgrading the i3 to i5 and Haswell (4th gen) is used due to Skylake (6th gen) i3 not yet reach Malaysia.

Intel Core i3 4160 - RM 497
Asus H81M-K - RM 229
Corsair 8GB DDR3 1600MHz Value RAM - RM 209
Leadtek GTX750 2GB GDDR5 OC - RM 480
WD Blue 1TB HDD - RM 225
FSP Hexa+ 550W - RM 189
Thermaltake Versa H25 - RM 139

Total: RM 1968 (Techview price inclusive of GST)

If you want to maximize your budget, you can either upgrade the CPU to Haswell i5 (+ RM 300), completely switch to Skylake i5 platform (+ RM 500) or upgrade the GPU to GTX960 (+ RM 350).

To solve the noise issue, get a new CPU cooler, no need to change entirely.

If you want to change CPU, yes you need to change mobo also.

A quick question ..
1)I went to check the casing , and i noticed there is no USB Port or possible removable port for it ??
* Just noticed its at the top side , instead of the traditional front side*
2) What about the heat issue ? This is what i gotten from their website
Cooling System 
Front (intake) :(optional)
120 x 120 x 25 mm x 2
Rear (exhaust) :
120 x 120 x 25 mm Turbo fan (1000rpm, 16dBA)
Top (exhaust) :(optional)
120 x 120 x 25 mm x 2"

If i want to change the whole CPU,
i reuse the 4gb ram
i reuse the intel i5-650 processor
i reuse the case also
exclude all this
1. Another 4GB RAM - RM 125
2. Zotac GTX950 Single Fan - RM 699
3. FSP Hexa+ 550W PSU - RM 189

a) How much more do i need?, i just need a motherboard that can support the graphics card.
b) is it possible to reuse the 4gb ram and i5-650 processor because i already used it for 4 years ?

CPU is your current i5 650, if you want to change whole CPU, you cannot reuse it. Maybe you don't understand the definition of CPU, CPU is the processor, some people misinterpret it as the whole rig.

So rethink again and let me know what is your next plan, either to keep using the CPU or change it.

1. you say that cpu bottleneck might occur if i change the graphic card and the ram only, is cpu bottleneck a big problem ? assume now im using my old cpu
2. i think that the gtx 960 might be too big because currently im using ati radeon hd5570 and the fan is just directly above the graphic card.

i3 is not possible with your budget, the cheapest i3 costs nearly RM 500 now.

Intel Pentium G3250 - RM 229
ASRock H81M-VG4 - RM 209
Kingston 4GB DDR3 1600MHz Value RAM - RM 99
WD Blue 1TB HDD - RM 219
FSP Hexa+ 400W - RM 129
Cheap casing (your choice) ~ RM 100

Total: RM 985

If you really want i3, you can just get those cheap case which bundles with PSU (roughly RM 100 in total for case + PSU), but you are warned that the quality of the PSU is totally unknown, don't come back and find me if anything happen to your PC  

hi, thanks for your advice .. I will take g3250 if that's the case, I do not need external graphic card right? due to processor already have integrated gc?

can I play some light game using this?

[Budget]
RM1500 - RM2000

[Purpose]
gaming, able to play far cry 4 and fallout 4. not necessary have to be high resolution

[Hardwares that will be re-use]
Monitor, keyboard, mouse, speaker

[Monitor resolution]
1920x1080

[Games & softwares that use frequently]
FPS Games

[Personal preferences]
ITX Casing

[Location]
PJ
Thanks in advance

[Budget]
RM1500 - RM2000

[Purpose]
gaming, able to play far cry 4 and fallout 4. not necessary have to be high resolution

[Hardwares that will be re-use]
Monitor, keyboard, mouse, speaker

[Monitor resolution]
1920x1080

[Games & softwares that use frequently]
FPS Games

[Personal preferences]
ITX Casing

[Location]
PJ
Thanks in advance

Intel Core i3 4170 - RM 486
Asus H81M-K - RM 229
Kingston HyperX Fury 8GB DDR3 1600MHz RAM - RM 220
Leadtek GTX750 2GB GDDR5 OC - RM 485
WD Blue 1TB HDD - RM 225
FSP Hexa+ 550W - RM 189
Thermaltake Versa H25 - RM 139
BenQ GW2255 - RM 390

Total: RM 2363 (Techview price inclusive of GST)

Most probably can run GTA V on low to med settings (1080p), population/traffic density and advance settings are not recommended to turn on.

Rig based on < 2K, this spec can run games at low/med settings, but please take note some games won't run on dual core i3 like Far Cry 4, if there are more games to follow this trend then you might need to consider upgrading the i3 to i5 and Haswell (4th gen) is used due to Skylake (6th gen) i3 not yet reach Malaysia.

Intel Core i3 4160 - RM 497
Asus H81M-K - RM 229
Corsair 8GB DDR3 1600MHz Value RAM - RM 209
Leadtek GTX750 2GB GDDR5 OC - RM 480
WD Blue 1TB HDD - RM 225
FSP Hexa+ 550W - RM 189
Thermaltake Versa H25 - RM 139

Total: RM 1968 (Techview price inclusive of GST)

If you want to maximize your budget, you can either upgrade the CPU to Haswell i5 (+ RM 300), completely switch to Skylake i5 platform (+ RM 500) or upgrade the GPU to GTX960 (+ RM 350).

Thank you soooo much Terence for helping me out.

May I know is there any alternative for ASUS H81M-K(Other model/brand),FSP Hexa+ 550W(Corsair/coolermaster would be more common at my local shops),Leadtek GTX750(Very rare to have Leadtek Brand here as well) and thermaltake Versa H25(Same goes to thermaltake,all bunches of coolermaster,corsair will be common)? As I'm located at KK sabah,some parts are difficult to find at my local shops.

Thank you so much for your effort,much much appreciate it     

I made a tweak using the same concept , hopefully sensei can enlighten my tweaking ..
Processor : Core i5 6550 @ 3.2Ghz Skylake
MOBO : MSI B150M Bazooka DDR4
RAM : Kingston Hyper X Fury 8GB DDR4
GPU : Zotac GTX960 Dual Fan MGS
HDD : WD Blue 1TB HDD
SSD : Kingston Now V300 128GB
PSU : Seasonic S12 II 620W
Casing : Thermaltake Versa H25

Any advice from this spec ?

This spec will over budget (you have max budget of 2.5K right?)

SSD - change to Kingston HyperX Fury/Liteon S900 for better NAND quality.

PSU - downgrade to S12II 520W/M12II EVO 520W (for good quality PSU) or FSP Hexa+ 550W (for mid range PSU) to save some money, GTX960 doesn't consume too much power so PSU selection is much easier.

Manage to increase my budget .. Hehe ..
SSD - Hyper x Fury should be ok , as the price only increase by a bit ..
PSU - Noted .. What about the brand Thermaltake LitePower 600W @ RM201 ?? Its almost the same price as FSP Hexa+ 550W

This spec will over budget (you have max budget of 2.5K right?)

SSD - change to Kingston HyperX Fury/Liteon S900 for better NAND quality.

PSU - downgrade to S12II 520W/M12II EVO 520W (for good quality PSU) or FSP Hexa+ 550W (for mid range PSU) to save some money, GTX960 doesn't consume too much power so PSU selection is much easier.