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Graphics Card - PSU Help


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#1
JakeMS

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Hi, I'm looking at a few graphics cards I can upgrade my gaming experience. In a previous thread I was helped and got links to buy a new PSU with 600 watts, I currently have 450 watts. I wanted to know how much this needs.

http://www.ebay.co.u...#ht_2248wt_1396

I'm not very good with specs, I couldn't see anything that says how much power it needs.

Web Address: www.asus.com
Model Number: ENGT440/DI/1GD3
Package Type: Retail
Warranty: 3 Years
Chipset: NVIDIA GeForce GT 440
Interface: PCI Express 2.0
Video Memory: 1GB
Memory Type: DDR3
Engine Clock: 810MHz
Memory Clock: 3600MHz (900MHz DDR3)
Memory Interface: 128-bit
Connectors: VGA‚DVI‚HDMI
DirectX Support: 11
Special Features:
Super Alloy Power technology delivers 15% performance increase, 2.5 times longer lifespan and 35°C cooler operation
NVIDIA PhysX
Dust Proof Fan to expand lifespan by 25%
GPU Guard doubles structural reinforcement. Cracks free!
Package Contents: Video Card‚Quick Installation Guide‚Driver CD
Product Name: ASUS 1GB GEF GT 440 DDR3
Stream Processing Units: 96
RAMDACs: 400MHz
Max. Resolution: 2560x1600
OpenGL Support: 4.0
Compatible OS: Windows XP‚Windows Vista‚Windows 7
Keywords: Video Card‚Graphics Card‚1GB‚DDR3‚NVIDIA 3D Vision‚NVIDIA PureVideo‚NVIDIA PhysX‚NVIDIA CUDA‚PCI Express 2.0
Gross Weight: 0.68Kg


I believe this is the official website...
http://www.asus.com/...I1GD3/#overview

If anyone could tell me I'd be grateful, if it requires more than I currently have then I will be upgrading anyway, but I am looking for good ones :)
Thanks!
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#2
phillpower2

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Hi JakeMS
I found two other brands of the NVIDIA GeForce GT 440 and both required a PSU with a minimum of a 300W output and 22 amps on the +12V rail also see the feedback from andrebm @ http://www.newegg.co...N82E16814121426 who has a 300W PSU.
Use a PSU calculator such as http://www2.corsair.com/psufinder/ (example only) and see what it recommends.
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#3
Digerati

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:( Yeah, that's the official site. Not very helpful, is it? The specs page does not specify the power requirements, and the download page does not provide a link to download the manual either.

So what I do is one of two things. Using the GPU chipset model number I punch in to my search engine: GeForce GT 440 power requirements and see what comes up. It looks like your 450W will do fine, assuming it has the right connectors. Or I use a good PSU calculator to determine my PSU requirements. Here is my canned text on sizing up and buying a new PSU.

Use the eXtreme PSU Calculator Lite to determine your minimum and recommended power supply unit (PSU) requirements. Plan ahead and plug in all the hardware you think you might have in 2 or 3 years (extra drives, bigger or 2nd video card, more RAM, etc.). Be sure to read and heed the notes at the bottom of the calculator page. I recommend setting Capacitor Aging to 30% (see my note below), and if you participate in distributive computing projects (e.g. BOINC or Folding@Home) or extreme 3D animated gaming, I recommend setting both TDP and system load to 100%. These steps ensure the supply has adequate head room for stress free (and perhaps quieter) operation, as well as future hardware demands. Research your video card and pay particular attention to the power supply requirements for your card listed on your video card maker's website. If not listed, check a comparable card (same graphics engine and RAM) from a different maker. The key specifications, in order of importance are:

  • Current (amperage or amps) on the +12V rail,
  • Efficiency,
  • Total wattage.
Don’t try to save a few dollars by getting a cheap supply! Digital electronics, including CPUs, RAM, and today's advanced graphics cards, need clean, stable power. A good, well chosen supply will provide years of service and upgrade wiggle room. Look for power supply brands listed under the "Good" column of PC Mech's PSU Reference List. Another excellent read is Tom’s Hardware, Who’s Who In Power supplies: Brands, Labels, And OEMs. Note that some case retailers “toss in” a generic or inadequate PSU just to make the case sale. Be prepared to “toss out” that supply for a good one with sufficient power.

Most PSUs have an efficiency rating of around 70%. This means for every 100 watts of power a PSU draws from the wall, only 70 watts is delivered to the motherboard, with the rest wasted in the form of heat. The best supplies are 85 to 90% efficient, and as expected, cost more. I strongly recommend you pick a quality supply with an efficiency rating equal to or greater than 80%. Look for 80 PLUS and EnergyStar Compliant labels. 80 PLUS PSUs are required to have fairly linear efficiencies. This is important to ensure the PSU is running at or near peak efficiency regardless the load or power demands. Non-linear PSUs typically are most efficient when the load is in a narrow range between 70 and 90% of the PSU’s capacity and the efficiency may drop dramatically above and below those amounts.

Too big of a PSU hurts nothing but your budget. Your computer will draw from the PSU only what it needs, not what the PSU is capable of delivering. If a computer needs 300 watts it will draw 300 watts regardless if the PSU is a 400W, 650W, or 1000W PSU. In turn, the PSU, regardless its size will draw from the wall only what it needs to support the computer. In this example, it will draw 300 watts, plus another 45 – 90 watts, depending on the PSU’s inefficiency.

As noted, the eXtreme Calculator determines minimum and recommended requirements. If the calculator (with the changes I suggested) recommends a 400 watt minimum, a quality 400W supply will serve you just fine. However, a quality 550W – 600W supply will have, among other things, larger heat sinks to dissipate potentially more heat. It might have a larger fan too. The 400W supply will run most of the time closer to capacity, while the larger supply will be loafing along, rarely breaking a sweat. To help the smaller heat sinks get rid of the wasted 80 watts (20% of 400) of heat, the fan in the 400W supply may need to run full speed, while the fan in the larger supply, with bigger sinks just loafs along too – but in near silence. Also, it is typical for manufacturers to use higher quality parts, design, and manufacturing techniques in their higher power supplies.

Note: Capacitor Aging. All electronics “age” over time. Electrons flowing through components bang around and create friction and heat causing wear and tear, altering the electrical characteristics of the device. Over time, this weakens the device resulting in eventual failure. Power supplies have always suffered profoundly from aging effects resulting in a loss of capacity. In a large part, this is due to capacitor aging though in recent years, capacitor technologies have improved in that area. The best PSUs use the best (and most expensive) capacitors which suffer less from aging effects than older capacitor types. If planning on buying a new, high-end PSU, setting capacitor aging to 10% may result in a more realistic recommendation. However, headroom “buffer” will be significantly reduced. You can expect your PSU to last 5 years or longer. Since it is better to buy too big rather than too small, and since it is hard to predict what your power requirements will be in 3 years, using 30% for Capacitor Aging ensures you have enough headroom for virtually any upgrade.

Don't forget to budget for a good UPS with AVR (automatic voltage regulation). Surge and spike protectors are inadequate and little more than fancy, expensive extension cords.


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#4
JakeMS

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Really appreciate the fast and informative responses! :)
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#5
phillpower2

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You are welcome and let us know if we can help with anything further.
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#6
JakeMS

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OK, first of all, thanks for being very helpful with my previous questions. I am pretty much wanting to upgrade my PC when I get my money in a few days! But seeing as I don't know much yet, and want to be 100% sure hehe, I am thinking of purchasing these 2 products.

http://www.ebay.co.u...#ht_2296wt_1396

http://www.ebay.co.u...#ht_1057wt_1396

From my own understanding, I won't have an issue. Corsair does seem OK, I have read many reviews, and the graphics card requires only 300w. I wanted to get an extra 50w for my pc to be safe, and I'm going a little over my budget here by buying for £120, hence the graphics card downgrade (I originally wanted a £100 graphics card).

Thank-you!
:)
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#7
phillpower2

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Save a few £s @ Novatech[
PSU £47.99 http://www.novatech....-500cxv2uk.html
GPU £63.98 http://www.novatech....t440di1gd3.html
Total = £111.97
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#8
JakeMS

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Brilliant! Thanks for the links, I'll be buying them ASAP.
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#9
phillpower2

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You are welcome and you know where we are if you need us :thumbsup:
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