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Old 03-03-2010, 01:40 PM   #1
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Default Amacrox Free Earth 85PLUS 650 W Power Supply Review

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Title: Amacrox Free Earth 85PLUS 650 W Power Supply Review
URL: http://www.hardwaresecrets.com/article/941

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"We've already reviewed a* power supply from the newcomer Amacrox (Free Style 85PLUS 650 W), which proved to be a product with an outstanding cost/benefit ratio. Let's see if their Free Earth 85PLUS 65..."

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Old 03-03-2010, 11:03 PM   #2
Olle P
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Quote:
This [power] distribution is perfect, ...
No, it isn't.
- The connector on 12V1 is supposed to deliver no more than 6.25A, although some graphics cards are known to pull as much as 9.2A off a 6-pin PCIe connector.
That's still far from the 18A available.
- The connector on 12V4 is supposed to deliver no more than 8.35A, which is also far from the 18A available.
- A very power hungry CPU will pull some 15A off 12V2, so that rail is okay.
- 12V3 is thus left with a nominal 275W of the 12V total, representing 5A more than the nominal limit for that rail!

A better solution would be to combine the two PCIe-connectors on the same rail (12V1), remove 12V4 and increase the current rating for 12V3.

Quote:
Usually with 650 W power supplies we try to pull 24.5 A from +12VA and 24.5 A from +12VB during our 650 W test, ...
Why not also take the nominal current limitations into account?
In this test you could have pulled 18A off 12VB (=12V2) while loading 12VA with 33A (spreading the load on 12V1 and 12V3). That may or may not have made a difference to the test result...

Generally I think it's best to stay within the nominal limits when testing PSUs (as well as other equipment) up to 100% of their nominal limit.
If that results in an unrealistic balance between for example 12V load and the lower voltages, then so be it! Make a note of it, perhaps also test with a more realistic balance, and then go on to see what happens when you try to pull more power.
Pulling more than 15A off the 12VATX/EPS connector is for example not something that's done in normal use, but if that connector is on the same rail as other connectors there might be some merit to it.

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Old 03-04-2010, 06:03 AM   #3
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Quote:
Originally Posted by Olle P View Post
No, it isn't.
- The connector on 12V1 is supposed to deliver no more than 6.25A, although some graphics cards are known to pull as much as 9.2A off a 6-pin PCIe connector.
That's still far from the 18A available.
- The connector on 12V4 is supposed to deliver no more than 8.35A, which is also far from the 18A available.
- A very power hungry CPU will pull some 15A off 12V2, so that rail is okay.
- 12V3 is thus left with a nominal 275W of the 12V total, representing 5A more than the nominal limit for that rail!

A better solution would be to combine the two PCIe-connectors on the same rail (12V1), remove 12V4 and increase the current rating for 12V3.
...

Cheers
Olle
I agree with Gabe here. Power hungry device shouldn't be in the same rail or the OCP is likely to trip.
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Old 03-04-2010, 10:22 PM   #4
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Quote:
Originally Posted by Travis View Post
Power hungry device shouldn't be in the same rail or the OCP is likely to trip.
I think that's my point! A single 6-pin PCIe connector is not very "power hungry".
The 24-pin connector can be expected to draw more power on the 12V line, since it's supposed to feed the same amount of 12V to the PCIe slots as one 6-pin connector, plus that it's supposed to feed the rest of the motherboard with suitable power!

So from a strictly 12V perspective the most demanding individual connectors are:
1: 8-pin EPS / 4-pin ATX. (Up to 16A.)
2: 24-pin ATX (7-10A)
3: 8-pin PCIe (Up to 10A, 8A standard)
4: 6-pin PCIe (Up to 9A, 6A standard)
5: Molex/SATA (<5A each. Starting a single HDD may require >3A.)

From this list it's apparent that on the Amacrox supply it's the 12V3 line that can be expected to take the brute of the load, whereas 12V1 and 12V4 have an easy going.

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Old 03-29-2010, 02:49 PM   #5
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Hi guys,

Just to let you know that I retested this unit after getting a second sample from the manufacturer. This second sample worked very well and we upgraded our recommendation on this unit.

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Old 03-30-2010, 01:02 AM   #6
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Did you notice that the 2nd sample had the OCP for 12V2 elevated from the <24A of the first sample to somewhere >27A?

Otherwise it seems fine.

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Old 03-30-2010, 07:39 AM   #7
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You are absolutely right! OCP was increased to 28 A.

Best regards,
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