Is this an OK PC gaming build?

Specs:
CPU: Intel Core i3-3220 (2 core 4 threads)
GPU: XFX Radeon HD 7770 1GB GDDR5/DDR5
RAM: 8GB DDR3 1333MHz
MOBO: ASRock H61M-DGS mATX
CPU Cooler: CoolerMaster Blizzard T2
HDD: 500GB WD Caviar SATA

I want to be able to run some games such as Minecraft, TF2, GTA IV, HL and Portal 2 at High to Ultra settings without lag.
I also need help finding a 450-500w PSU between £35-45, what would you ppl recommend?

Can a wooden doorway be taken down in Rust?

In the popular game Rust which is like a mixture of Minecraft and DayZ in a way, can you take down a wooden doorway? I've been hacheting for a while and it won't come down.

Username and email for minecraft?

So I was making a minecraft account but forgot i needed to buy the game so i canceled it and I was logged in so i went back to the website and realized i was logged out and i try logging in and i realized it said username so i try putting the one i want it and it didn't work so i put my email address and it worked but when i buy the game will my username be my email or can i still make a username?

How to update Minecraft to 1.7.4?

I'm having trouble updating my Minecraft client to 1.7.4. It is on a older version but each time I try to open the game, it loads to the old version even after I download the latest software.

I took a screenshot (or screenvideo… Whatever you want to call it) and posted it here:

http://screencast.com/t/rZJvwB5sr

(I forgot to turn my music off. Sorry).

Spiking GPU usage while playing Minecraft?

I'm concerned about my videocard because my previous videocards died from Minecraft. First videocard overheated (but only fan was damaged), second videocard was runing nice after playing Minecraft, but next morning i get black screen when turning on computer. Why Minecraft damaged my previous videocards? And why now i'm getting spiking GPU usage while playing Minecraft, one second it's 70% and then other second 0% and so on. I'm Really concerned about that, but i also want to play Minecraft, because it's kinda creative game. My biggest worry is that i will burn my new videocard that cost me 130 Dollars.

My GPU-Z screen:
image

My specs:
Pentium(R) Dual-Core E6500 2.93 GHz
RAM: 3.00 GB
Windows 7
AMD Radeon HD 7770 1GB

My Previous videocards:
Nvidia GeForce 8600GT 512MB
Nvidia GeForce 9800GT 1GB (I'm not if it was 1GB or 512MB)

Added (1). My previous videocards didn't have issues with other games, only with Minecraft.
And only Minecraft gives me spiking GPU usage, other games work fine and GPU usage is steady.

Added (2). raina_vissora… It only happened after/when playing Minecraft. (for old videocards)
And same for new videocard… I only get spiking GPU load when playing ONLY Minecraft. Other games work fine and GPU load is steady.

If I buy a minecraft giftcard will it download on two computers?

I'm buying a minecraft game card at Walmart tomorrow and I'm downloading it on my computer, however in 6 months I might get a new computer. If I make my account and download it on my first computer will I be able to use my same account to download minecraft on my new computer?

Help on slime farm minecraft 360?

I have gone to bedrock and cleared out a spare of 50X50 and made sure it light enough for other mobs not to spawn but I not getting any slimes can anyone help me figure out what I doing wrong the room is 4 blocks high

Why can't i log into my minecraft account?

I have changed my password, so the password is definitely correct, and the email address is also correct so i should be able to log in but i can't! No complicated answers please