Originally Posted by Majestic_Lizard
The ratings for that brand's video cards have not been stellar (nor were they terrible). Links were posted. Some generic 700 power supplies are actually 450 watt power supplies with 700 watt power supply stickers on them. SO, NO, ALL 700 WATT POWER SUPPLIES ARE NOT THE SAME. PERIOD.
Many hardware sites have discovered this and revealed it of certain models of their PSUs. Build quality does very. Please understand that when a minimum requirement for a video card on the 12 volt rail is 46 amps, that mathematically equals 550 watts for the single card alone. (AND NO, FOR THE LITERAL MINDED, THAT DOES NOT MEAN THE CARD ACTUALLY USES 550 WATTS!! IT IS A SAFE THRESHOLD.)
Edit (FURTHER EXPLANATION OF MY POINT - NOT A REDACTION): THE REQUIREMENT FOR THE GTX 580, GTX 295, and GTX 480 are all 46 amps on the 12 volt rail. However, the GTX 295 requires a 680 watt power supply, and the 480 and 580 only require a 600 watt power supply. This is because they are referring to the 12 volt rail alone when they refer to the 46 amps. Otherwise the total amperage requirement would be the same for all cards. Now the actual cards actually use different amps and less than 46. But the 46 amps is the SAFE RATING. The fact is that the GTX 295 dual PCB uses the most amps, followed by the 480, followed by the 580 at about 32 amps. But the 46 amps gives you some cushion in due to many factors that can effect efficiency reducing the amps left available to the power supply.
To make this symple:
GTX 295 uses 416 watts on a load, but has a 46 amp requirement (requires 680 watt PSU)
GTX 480 uses about 370 watts on a load, but has a 46 amp requirement (requires 600 watt PSU)
GTX 580 uses about 363 watts on a load, but has a 46 amp requirement (requires 600 watt PSU)
IF THE 46 AMP RATING REFERRED TO THE ENTIRE SYSTEM (WITH GOD KNOWS WHAT CPU AND HOW MANY DRIVES) THEY WOULD ALL REQUIRE THE SAME 550 WATT POWER SUPPLY. NOTICE THAT THEY DO NOT.
In synthetic benchmarks it gets a little heavier.
Notice the power supply recommended for these cards by the author.
I really don't need to comment here. This like saying the way a combustion engine automobile uses gasoline has nothing to do with how fast it drives. The reason 80 Plus Certified is a big deal is not related to people wanting low electric bills (although this is an additional benefit of efficiency) it is related to wanting stable and strong power for the 12 volt rail with little rippling.
See comments above. These things are related to one another, they are not mutually exclusive.
This was once true, but is no longer the case with the high resolutions being used with gaming (2560x1600). The way that windows accesses memory comes into play. There is an outdated article on Tom's Hardware that states that video card memory doesn't matter, but in the benchmarks of the article you can clearly see that for resolutions af 2560x1600, it undoubtedly does. This goes doubly when anti-aliasing is enabled on these resolutions.
Dude ... seriously ... no offense, but nearly everything you've posted here is ... hilarious.
The Coolermaster 700W Extreme Power, we both agree, is not a great PSU. However, it's NOT a 450W generic unit w/a 700W badge on it. And nobody ever implied that all 700W PSU's are created equal. Nice try with the straw-man there though
The point is, THAT 700W unit is more than adequate for any single card setup. Period. If you think it's not, then you are simply not doing your math correctly.
Any PCI-Ex card that has only a 6-pin and an 8-pin connector is not legally allowed to draw more than 300W. Yes, you as a consumer can cause some cards to consume a bit more wattage than that via OV/OC'ing, but out of the box, stock ... a card w/this plug arrangement is not allowed to draw over 300W.
Ergo, all of your claims about power consumption for the 295, 580, and 480 are comically over-inflated.
And as I said before, you are wrong about the 'meaning' of a PSU's efficiency rating. It has NOTHING TO DO with 'stable power' or 'low ripple'. Efficiency is the ratio between the power provided to your components divided by the amount of power pulled from the wall. PERIOD.
And your car analogy is really great ... for a laugh. The fastest cars in the world get like 1 mile a gallon, dude.
And your little part at the end there, where I was talking about system RAM, and then you go on and post Tom's articles that are on the subject of VRAM and not about system RAM ... classic lulz.
Originally Posted by Majestic_Lizard
I have tried to be polite and patient. This individual is the one giving out VERY WRONG information.
3) "A GTX580 DOES NOT require 46A of power. That rating is for the whole system with the card in it."
I didn't say the GTX580 used 46A of power, did I? I said that was what the minimum requirement of the manufacturer. I said 46A equals 550 watts of power. If this person had read one of my posts in another thread you would see that the GTX580 uses 363 watts.
The manufacturer's requirement for a GTX480 is, at the minimum, a 600 watt power supply with 46 amps on the 12 volt rail. It doesn't say 46 amps for the entire system, it says 46 amps for the 12 volt rail. 46 amps does mathematically equal about 550 watts, NOT 600 watts. Meanwhile, the GTX295, which also has a 46 amp rating also does not require a 550 watt power supply, it requires a 680 watt power supply. Both have 46 amp rating, but both have different total wattage requirements WELL ABOVE 46 AMPS (550 WATTS).
Lizard ... you are cracking me up with this stuff.
Listen close ... I'm going to spell this whole thing to you one last time:
nV is recommending a 600W power supply with at least 46A on the 12V+ rail for an ENTIRE SYSTEM (gpu, cpu, board, drives, etc) that is running a GTX580 card.
And when nV makes such recommendations, they VERY MUCH take into account the fact that plenty of users are going to be buying very 'ordinary' PSU's like the Extreme Power, as opposed to Corsair and Enermax and the like.
As such, the OP's system would probably work fine on a really good 500W unit that has just a bit of headroom over the rating. Or, a 700W unit that's probably really just a 650W unit ... is also going to be fine.
The CM Extreme 700W is not a great PSU, but it's also not a sub-600W unit w/a 700W badge on it. In order for you to 'win' this debate, you need to prove that this PSU is NOT really capable of providing the 600W (and/or 46A on the 12V rail) that nV is stating as recommended for this card.
If you cannot do so, then I think you have to concede that my original point about this PSU being fully adequate for the OP's (potential) system ... is valid.
BTW, you seem to think there's some huge 'meaning' to the fact that the 295 had a different Wattage recommendation (680W) from that of the 480 and 580 (600W), while having the same 12V+ recommendation of 46A ... but guess what? nV didn't make a 12V+ amperage requirement for a system running the 295. They suggested a 680W PSU, period. Therefore the 'points' you THINK you're making in your repeated bold, red paragraphs
... are based on a false premise.Edited by brettjv - 12/25/10 at 1:29am