Three 12V lines at 18A

I have a PSU that has 12V1@18A, 12V2@18A & 12V3@18A. I have been using a GeForce 8800 GT without issue for a while now, but I have been looking to upgrade recently, and have been doing a bit of research. I came across a site that suggests for a lot of the cards that I am looking at that I would need a 12V line at 24A, which is also what my current card apparently requires. How does it work with my three lines? If I am only using one, can my card have accesss to the other 36A's on the other lines? (The potential upgrade cards I am considering are 460/560, probably from eBay).

The most graphically dependent game I have ever ran on my current setup is Sid Meier's Railroads, it runs smooth on 4AA and medium settings, but jittery on 8AA max settings (@1680x1050 my max monitor res), basically I'd like to run that game on full whack on my current monitor, and I would like to start playing other games such as BioShock 1.

I have recently bought a Core 2 Quad Q6600 to replace a Core 2 Duo E6750, but it hasn't been delivered yet. My motherboard was bundled with a Medion and I know it does not support CPU overclocking, ut could I overclock my graphics card?. Nothing in my system is overclocked.

I am in the UK. Thanks for any advice.

Edit:
My PSU is an Arctic 500W, I would prefer to avoid the expense of a new one.

For example, this is info about a 460 GTX
http://www.nvidia.co.uk/object/product-geforce-gtx-460-uk.html
Thermal and Power Specs:
Maximum GPU Tempurature (in C): 104 C
Maximum Graphics Card Power (W): 160 W
Minimum System Power Requirement (W): 450 W
Supplementary Power Connectors: 6-pin & 6-pin - Does this part indicate it uses two lines?

I am considering a bid on this item http://www.ebay.co.uk/itm/261133220379?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
5 answers Last reply
More about three lines
  1. What model PSU is it? If you've been running an 8800 GT without issue you're most likely good to go on a newer midrange card.
  2. It depends on how the PSU deals with the 12v rails, the two types are Independant, and combined.
    Independant will provide say 18A for example to each 12v rail at a max, where as a combined rail 12v rail setup will be able to switch how many amps are required on a rail by taking some off the others to balance the Amp draw. A good quality PSU is a must so dont skimp on it, make sure you buy a well known branded name of PSU.
  3. My PSU is an Arctic 500W, I would prefer to avoid the expense of a new one. I have edited my first post with some more info.
  4. This is the site I am referencing:
    http://forum-en.msi.com/faq/article/printer/power-requirements-for-graphics-cards
    GeForce GTX 460 - 26A and a 450W PSU minimum
    GeForce 8800 GT - 26A and a 450W PSU minimum
  5. Update:
    I have reluctantly conceded that I need a new PSU. I have won an eBay auction for a PNY GTX 460 Enthusiast Edition http://www3.pny.com/GTX-460-OVERCLOCKED-1024MB-PCIe-P2899C434.aspx

    I would love advce for a new PSU, should I start a new thread?

    My system is going to be:
    Mobo: MSI MS-7358 Medion (I recognise this as a weakness)
    Intel Core 2 Quad Q6600
    PNY GTX 460 Enthusiast Edition
    4Gb DDR2 800Mhz
    500Gb + 300Gb SATA HDDs
    2x DVD R/Ws
    3x 120mm Case fans

    Future plans: I am unlikely to ugrade again for a least 2ys, and I would only look to upgrade to a Intel i5, I wouldn't upgrade the graphics card, and am unikely to ever want to run multiple graphics cards.
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