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PostPosted: Wed Jun 30, 2010 1:48 pm 
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HammerSandwich wrote:
How did SPCR determine the average consumption? Were any comparisons made to the Power Angel's KWh?


The correct way to make this measurement is to run a set of various application tasks, measure the total power used and time how long it took to run the test. Average power is total power used divided by total time.

A Power Angle or KAW is no good because it measures the total power used by the computer. That's effected by the MB, video device used, etc.


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PostPosted: Wed Jun 30, 2010 11:54 pm 
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m0002a wrote:
Thomas wrote:
That's the current retail price - it might lower, but who knows...

When I say retail price, I mean the actual price charged by a retailer such as Newegg. I don't mean what AMD says is the projected retail price. Last time I looked, there was no price listed on NewEgg (chip was not in stock).

I suspect that both AMD and Intel make adjustments to their prices based on competitive offerings.


Sadly, it's current streetprices where I live. And no, Newegg is not an option for me, due to shipping overseas + ridiculus local taxes and fees.

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PostPosted: Wed Jun 30, 2010 11:56 pm 
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m0002a wrote:
Thomas wrote:
There's some (only a few?) exceptions - me? I'm running some Nikon software, which is ridicolus CPU consuming. Except for that, I dont need much CPU power - my 4850e was good in all other aspects and sadly, it's now collecting dust...

Does that Nikon software make use of more than 2 cores (or even one core) at a time?


Yes it does.

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PostPosted: Thu Jul 01, 2010 2:11 am 
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RoGuE wrote:
the X4 910e system used 34.7 W-hrs during the tests, while the much better performing X4-635 used 38.6 W-hrs. If one were to run these tests 24/7 on both computers, running the X4 910e would save you roughly .0936 kWh per day. Say your electric bill is about $ .11 per kWh (US national average)..this means it would take you 681 kWh's to recover the extra money you spent on the energy efficient processor. Given you are only saving .0936 kWh per day, you would have to run this system 24/7 for 6818 days or 18.68 years to break even on the increased cost of this processor.

Is it worth it? Unless you are on a mission to save the environment from the evils of silicon valley...no.


Nice calculations. But you didn't take into account the extra time needed to perform the same task due to the lower performance. So you may actually end up using MORE power on the e system.

Lastly, SPCR, are you sure the TDP you are quoting is actually TDP? AMD normally works with ACP (average cpu power) which is actually lower than the TDP (thermal design power)


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PostPosted: Thu Jul 01, 2010 9:06 am 
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b_rubenstein wrote:
The correct way to make this measurement is to run a set of various application tasks, measure the total power used and time how long it took to run the test. Average power is total power used divided by total time.

A Power Angle or KAW is no good because it measures the total power used by the computer. That's effected by the MB, video device used, etc.

First, the article clearly states that SPCR used a Power Angel to measure total system consumption.

Second, your calculations ain't right. Power * time = energy. So dividing accumulated KWh by time gives average power.

I'm not sure if SPCR's multimeters can log the CPU/VRM consumption or if they provide only instantaneous results. The Power Angel may be their only way to determine average consumption with varying loads.


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PostPosted: Thu Jul 01, 2010 3:03 pm 
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murtoz wrote:
Lastly, SPCR, are you sure the TDP you are quoting is actually TDP? AMD normally works with ACP (average cpu power) which is actually lower than the TDP (thermal design power)

I think AMD only uses ACP when they're talking server CPUs like the opterons. And they usually specify both. TDP for engineering maximum thermal cooling required. ACP for estimating power usage such as for data centers. I've never seen it mentioned for desktop CPUs.


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PostPosted: Thu Jul 01, 2010 6:38 pm 
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murtoz wrote:

Nice calculations.


Thank you! I'm glad someone appreciated that statistic!

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PostPosted: Wed Jul 07, 2010 8:37 am 
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Eh.

200 dollars is pricey considering on board video for Intel sucks. Not to mention the boards are more money to get less features. A LOT LESS features. And of course, you can get a 4290 on board video with amd for less than 110 dollars.

I am not a fan of amd vs intel, but did anyone check out the x3 720? 104 dollars shipped. Beats the pants value wise off of the 750. You can save 150 dollars going amd in that regard. (board + chip price difference) I would guess the wattage saved after a couple of years would negate some of this if you paid a lot for electricity.... I guess? shrug?

I know it wasnt included in the review as quads are quads. just my thoughts though concerning the best actual values.


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PostPosted: Sun Jul 11, 2010 3:21 pm 
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There's never a question that Mike C has great articles. But there are other questions that always need asking.

Have you seen the non-e voltages? Why were they so high in the first place? Just so that they would be easily overclocked?

Who's going to recoup the price difference of the e version over it's lifetime? That's referring to just electricity, not any possible savings in cooling outlays.

I'd like to see just how low half a dozen non-e equivalent cpus can go before I make such an investment.

Costs at idle matters only those machine that spend most of their time idling. Cost/work done is a more important indicator.

Quote:
I am not a fan of amd vs intel, but did anyone check out the x3 720?

Check the archives for other X3 reviews, you may find the 720 in there for comparison purposes.

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PostPosted: Thu Jul 15, 2010 4:04 am 
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Quote:
From what we can gather, the only real selling point of these CPUs is the lower operating temperature... but then again, most standard AMD processors undervolt fairly well.

I strongly disagree with this sentiment. Overclocking or undervolting is a crapshoot. What happens when you get a processor that doesn't undervolt to your expectations? You can't return it. So you're stuck with a processor that doesn't meet your expectations.

If you get one of these low power processors then you are guaranteed the lower power and lower temperature characteristics.

The lower temperature that these processors exhibit is a big deal. It allows a smaller heatsink, or a passive heatsink.

But most importantly for me is that heat has to be paid for twice in hot climates. You can't calculate the ROI based solely on differences in power draw. You have to factor in cooling costs. A hot CPU really heats up a room and the AC has to work that much harder to compensate in the summer months.


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PostPosted: Sat Jul 17, 2010 8:23 am 
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I'm not sure how the 'e' chips would weigh down on me if I hadn't picked up all three of my X2 235/235/240 'e' purchases at 25-30 quid; Sempron 140 prices, 2-3 weeks before the official launch. There was nothing that could touch them at such cost.

Some 'e' designated chips are well binned and not just undervolted to meet spec. The second X2 235e I chose to run in my AIO comes at 29W DC at the 12v at 1.350v stock, and I run it undervolted to 1.03v 2.7GHz. Imagine the power drop... it was not possible with a standard power 245/250 chip available back then, or even now.

I wouldn't have bought it if I wanted OC'ing but default voltage gets it to 3.64GHz stable. As a side note, I typically run it with the HD 4200 IGP but if required, I just add a passive HD 3650, or a passive HD 3850. The one low-speed fan at slo-mo helps significantly. The passive HD 2400/HD 4350/HD 5450 I tried before these were abysmal to replace the IGP with - hardly adding anything except power/heat.


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PostPosted: Sat Jul 17, 2010 12:32 pm 
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One factor missing in these equations is the cost of one's time. Obviously that varies significantly depending on whether one is a student, unemployed/underemployed, or has fairly high paying job.

Considering all the money I spent previously on fans, controllers, wildly expensive CPU coolers, and the like, and what I perceive to be the value of my time, paying an extra $25 for "e" is well worth the cost, especially if I don't have to worry about how to under-volt a regular CPU or whether my MB can do it easily.

Basically for similar reasons, I quite mowing my lawn a long time ago, and pay someone else to do it. The extra time I spend on my personal life, or my job, pays bigger dividends in the long run. But if I were a student, I obviously would have other prorities (although if I were a student, I probably would not worry about the noise as much).


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