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Antec TPII 550EPS12V or Cooler Master Real Power 550 power supply???
Does anyone have any experiences with either the Antec TPII 550EPS12V or the Cooler Master Real Power 550 power supplies? They both are rated at 550 watts, with ATX 12V 2.01 and EPS 12V 2.1. The Cooler Master has a power output meter and a blue fan, so I am kind of leaning towards it. any comments on either model??? tks. - brian |
#2
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brian wrote:
Does anyone have any experiences with either the Antec TPII 550EPS12V or the Cooler Master Real Power 550 power supplies? They both are rated at 550 watts, with ATX 12V 2.01 and EPS 12V 2.1. The Cooler Master has a power output meter and a blue fan, so I am kind of leaning towards it. Depends whether you want power/known-good or style The first thing to note is that the Antec has one huge 12V rail, and the CoolerMaster has a 3-way split. This is due to EPS12V 2.1 spec requiring that all PSUs comply with IEC 60950-1, which essentially stipulates that there should be no lines capable of supplying more than ~220W. This limits the 12V rails to 18A each. The CoolerMaster only does 30A on the 12V, so should (IMO) have gone with an 18A/12A split. Instead they went with a 12A/12A/6A 3-way split. Given that even a 2-way split causes problems with some dual-processor boards, I'd be very cautious about using the CoolerMaster in such a situation. The Antec shows complete disregard for the safety regulations and will happily pump out 36A from a single 12V rail. This can be a bad thing if something gets close to shorting out (400W of energy being pumped into anything is generally bad), but also provides marginally better rail stability. As far as the actual power outputs go, the Antec has a slight lead on the CoolerMaster. Additionally, it's known to be an incredible power supply, capable of running pretty much anything (dual overclocked Xeons? No problem. SLI? Doesn't even notice). I'm using one at the moment to power a dual Duron system; a complete waste of the power but I'm intending to keep it for my next major system upgrade (whenever that occurs). The Cooler Master has less of a track record, having only come out last month, but certainly looks a lot nicer and is quiter than the Antec. However, unless you're building something that actually needs such immense amounts of power (or reliability; I'd definately choose the Antec over the Cooler Master for a server), either PSU will do the job fine. At which point it comes down to which one suits you better and the prices involved. [...] -- Michael Brown www.emboss.co.nz : OOS/RSI software and more Add michael@ to emboss.co.nz ---+--- My inbox is always open |
#3
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ummm... they look similar, but I don't think so. the max loads on the 12v rails of the AcBel are 12A,22A,14A while the max loads on the Cooler Master are 18A,20A,10A. the AcBel doesn't have all of the connectors that the Cooler Master does, either. interesting... I wonder how either the Cooler Master or the AcBel would hold up in an SLI system. - brian |
#4
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http://www.ocztechnology.com/p=ADrod...p=ADowerstrea= m_power_supply The OCZ 520w Powerstream looks like a winner to me. It also looks like it has a single 12V rail, like the Antec. I wonder how it compares to both the Antec TPII 550EPS12V and the Cooler Master Real Power 550 for SLI performance. - brian |
#5
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CSE wrote:
[...] Separate regulated 12V supplies are far far better. I don't beleive I've seen any testing, reasonable or not, that showed that a split-rail PSU was any better or worse (voltage stability or ripple wise) than a single-rail PSU. On the other hand, there are several dual-Xeon boards that are known to not be stable with split-rail supplies once you hit about 3GHz. From a purely theoretical perspective, a single large rail handles load changes better, and as far as I can tell, safety regulations are the main reason behind split rails. [...] -- Michael Brown www.emboss.co.nz : OOS/RSI software and more Add michael@ to emboss.co.nz ---+--- My inbox is always open |
#6
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"Michael Brown" wrote in message ...
CSE wrote: [...] Separate regulated 12V supplies are far far better. I don't beleive I've seen any testing, reasonable or not, that showed that a split-rail PSU was any better or worse (voltage stability or ripple wise) than a single-rail PSU. On the other hand, there are several dual-Xeon boards that are known to not be stable with split-rail supplies once you hit about 3GHz. From a purely theoretical perspective, a single large rail handles load changes better, That claim is downright silly. |
#7
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Rick wrote:
Michael Brown wrote: [...] From a purely theoretical perspective, a single large rail handles load changes better, That claim is downright silly. Perhaps I need to be more precise. Start with two identical devices, A and B, each consuming a constant 8 amps. Consider two PSUs: one with two rails of 12A each and one with a single rail of 24A. Given two identical devices, A and B, the sensible configuration for the split-rail PSU is one device per rail, and the only configuration for the single-rail PSU is both on one rail. Assume that all three rails have the same hold time curve (the usual theoretical one for buck regulators) with respect to the maximum rated current with respect to their maximum rated current. If device A instantly increases it's current draw by 2A then in the average case: {} On the split-rail setup, device A will see a voltage drop of a certain amount (since current usage has increased by 25%), device B will experience no voltage drop. {} On the single-rail setup, device A will see a smaller voltage drop, and device B will see an identical voltage drop. This voltage drop will be slightly more than half the voltage drop experienced by device A in the split-rail setup. Sum-of-squares-wise, the single-rail setup will have a smaller deviation from ideal than the split-rail setup. Additionally, the maximum deviation from the ideal voltage will be smaller, which is a good thing. The benefit of a split-rail configuration is that one of the devices (device B in this case) experiences no (or in most cases, minimal) deviation from the ideal voltage. IMO the single-rail situation is preferable in most situations, as it's usually the maximum deviation that gets you stability wise, as opposed to noise on the power line. OTOH, if you are pushing your PSU right to the limit, such that out-of-tolerance voltage sags would occur on a single-rail setup, then a dual-rail setup would possibly be preferred as it would isolate a problem spike to a single rail (though the size of the deviation would be much larger than a single rail setup, which could cause additional problems). Better? -- Michael Brown www.emboss.co.nz : OOS/RSI software and more Add michael@ to emboss.co.nz ---+--- My inbox is always open |
#8
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On Mon, 2 May 2005 15:27:16 +1000, "Michael Brown"
wrote: brian wrote: Does anyone have any experiences with either the Antec TPII 550EPS12V or the Cooler Master Real Power 550 power supplies? They both are rated at 550 watts, with ATX 12V 2.01 and EPS 12V 2.1. The Cooler Master has a power output meter and a blue fan, so I am kind of leaning towards it. Depends whether you want power/known-good or style The first thing to note is that the Antec has one huge 12V rail, and the CoolerMaster has a 3-way split. Actually, the old Antec TRUE 550 EPS had the 36A 12v rail. +5V 40A +12V 36A ======== +3.3V 32A -5V 0.5A -12V 1.0A The new Antec TruePower 2.0 TP2-550 EPS12V version has dual 19A 12v rails for a slightly higher total (in theory). +5V 40A +12V1 19A ======= +12V2 19A ====== +3.3V 32A +5SB 2.0A -12V 1.0A * +5V, +3.3V, +12V1, 12V2 maximum output 530 Watts max. ! ! ! ! ! Notice that 530Watts max. If you add up the max individual loads you'd think you were getting 5x40= 200watts 12x19= 228watts 12x19= 228watts 3.3x32=105.6watts -------------------- 761.6 watts not even counting the junk rails. Gee you'd think it was a stereo or something Personally, I'd want to hook my mega slam dunk video card to a 36A 12V rail. Especially considering those so called high power supplies are putting out a lot less than you'd think. But the good news is you can still buy a GREAT 600WATT POWER SUPPLY for $20 according to the EXPERTS. insert long laugh here |
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