Where the CPU is the brain in a PC the PSU (Power Supply Unit) is the heart.
http://en.wikipedia.org/wiki/Power_supply
If the specs on your PC state that the PSU has a max 300watt rating/load limit. This means the total power consumption on the system must not exceed that.
There is no easy way to measure this, short borrowing some pro gear your best bet is pull out a calculator, add up the max watt rating of all the components and devices in your system.
If the PSU limit is hit or passed a number of things can happen;
If it is a older type of PSU it might have a fuse that blows,
if it's a more modern one the PSU most likely have no fuse and will either do a panic shutdown of the PC to avoid damage,
or worst case the circuits in the PSU will fry, repairing it may cost as much as or more than buying a new one. If it keeps working despite being overloaded the system will most likely be unstable. (memory corruption, CPU crashes, Blue Screen, lockups, etc)
As to a graphics card, go for a modern lower midrange priced one that support current standards (Pixel Shader 3.0 support for example). If you are a casual gamer this will be cheaper in the long run as a graphics card upgrade in 2-3 years won't hurt as much as you really didn't spend so much.
Considering your current system I'd strongly advise doing that as in 2 years or so you may want to do a more proper system makeover. In which case I'd advise PCI-Express instead of AGP and AM2 socket motherboard and AMD2 socket AMD cpu or the intel equivalent, DDR2 ram (or DDR3 if it is available at that time for the CPU platform you choose)
Myself I got a AM2 socket motherboard with PCI-Express, and AM2 socket AMD Athlon 64 cpu, DDR2 ram (DDR1 not supported and outdated and DDR2 is cheaper anyway), Geforce 7600GT PCI-Express (handles any game currently out there and should be fine for a few more years) pixel shader 3.0 and all that good stuff, Audigy 2ZS sound card, and SATA hard-disks.
Hardcore gamers would stick their nose into the sky if they saw such a PC as mine, but I know better, I'll be the one laughing when they shell out hundreds and hundreds for the next best thing hot out the door.
And don't bother about SLI graphics, not worth the cost, get a better GFX card instead of going SLI.
Same with Dual or multi core CPU's, don't bother with that yet,
get a better single core instead.
Myself I'll be waiting until Vista and DX10 optimized games has been around for a bit and the DX10 graphics cards are into their 2nd or 3rd gen, and by that time there will most likely be plenty of affordable quad core cpu's as well, and game developers will have managed to properly make use of multiple cpu's for a while.
So, to sum it up. Go for lower midrange your wallet will not only thank you now, but thank you again the next time you upgrade.
As you will be able to do more frequent upgrades compared to a highly costly upgrade once each 6 years and still end up 4 years behind "
current tech"
One thing to keep an eye on is features, make sure that the GFX card you buy support all current standards (like Pixel Shader 3.0) as that will ensure you will be able to play future games without issues, maybe not at super frame rates in a few years but still play it without cursing yourself because a game "
require"
Pixel Shader 3.0 (as a game recently did and pissed off a bunch of gamers who only had GFX card capable of doing Pixel Shader 2.0, ugh) Although it may be tempting to go for a 512MB gfx card, don't. Not much gain compared to 256MB ones, esp on lower/midrange cards.
There is no way to get the perfect gaming rig, hardcore gamers know this yet they still buy the latest and greatest constantly.
Go low or medium midrange price, check out places like Toms Hardware
http://www.tomshardware.com/ for their various tests on CPU, GFX cards and motherboards.
It is however possible to get a "
good"
gaming rig which is also one helluva all-round system.
Ride the tailcoat. Hardcore gamer hardware drops in price as the latest hardcore gear hits the market, so yesterdays (or year rather) hardcore gamer gear becomes a affordable gear that last you several years worth of fun.
PS! If your PC is a ATX PC (the case and motherboard follows the ATX design standard in size and shape that is)
Then you should be able to buy a new and beefier ATX power supply and replace the old one in your PC case.
____________________________
"
Normality exist in the minds of others, not mine!"
- Rescator
http://emsai.net/ - Yep! I got a Journal even and lot's more!
[Last edited by Rescator at 01-04-2007 03:10 AM]