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Old Jul 5, 2009, 08:54 AM   #26
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System Specs

Quote:
Originally Posted by hat View Post
You know... you're the first person I've ever heard say that... can you back that statement up?
I don't need to. Read up.
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Old Jul 5, 2009, 10:39 AM   #27
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Actually, PCIe x16 slot is, regardless of generation, 66W (5.5A) at 12V and 9.9W (3A) @ 3.3V.
If PCIe 2.0 slots were 150w, which they aren't, and a card would draw >75W from the slot then imagine what would happen when such a card is plugged in a PCIe 1.x slot?
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Last edited by largon; Jul 5, 2009 at 11:16 AM.
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Old Jul 5, 2009, 09:17 PM   #28
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I wonder what w1zzard meant when this was made:
http://www.techpowerup.com/articles/...ocking/psu/116

anyway, http://www.10stripe.com/featured/qui...ess-2-0.php#bw

It's 150W if you use a 6-pin PEG, which adds 75W onto the 75W pulled from the board.

EDIT: could you imagine pulling more than 75 watts from those little traces anyway?
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Old Jul 5, 2009, 09:22 PM   #29
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Quote:
Originally Posted by Necrofire View Post
I wonder what w1zzard meant when this was made:
http://www.techpowerup.com/articles/...ocking/psu/116
there were times when that whole pcie power connector was a magic black box with wires going into it and nobody knew details
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Old Jul 5, 2009, 09:27 PM   #30
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Quote:
Originally Posted by W1zzard View Post
there were times when that whole pcie power connector was a magic black box with wires going into it and nobody knew details
Or no one wants to get a PCI-SIG membership and read the 700+ page specifications pdf on pcie 1.1 and 2.0

speaking of power though, which cards are eligible for a power reading from software? My ASUS 4850 isn't.

And speaking of that page I linked, I have two molex-peg connectors that don't have the middle bottom pin, but the 3 psus I've checked all have that pin present as a +12v pin on the peg power.
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Old Jul 6, 2009, 07:03 AM   #31
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Quote:
Originally Posted by Necrofire View Post
It's 150W if you use a 6-pin PEG, which adds 75W onto the 75W pulled from the board.

EDIT: could you imagine pulling more than 75 watts from those little traces anyway?
I's a fact that slot power is not used for powering GPU if there's an external power connector onboard. Slot power is typically used just for powering the GDDR (vDD+vDDQ) and in some rare cases, low power secondary GPU loads, for example vDDCI on X1900 Radeons.

For example, nV GTX200 series use 15-20W of all available slot power. HD4890 uses <30W from slot.
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Old Jul 7, 2009, 01:28 AM   #32
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Is this Furmark more 4800 series friendly?
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Old Jul 7, 2009, 01:35 AM   #33
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Quote:
Originally Posted by btarunr View Post
I don't need to. Read up.
I guess we shouldn't even have this website then, since everyone should have to find information for themselves :/

http://www.pcisig.com/specifications...ress/graphics/
"PCI-SIG announces the availability of the PCI Express® x16 Graphics 150W-ATX Specification 1.0. This is another in a series of specifications that attest to the continued momentum in the adoption of PCI Express architecture as the general-purpose I/O interconnect of choice in computing and communications industries."
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Old Jul 7, 2009, 05:04 AM   #34
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Some boards have the option for provinding a set amount of power to the PCI-e slots, and most limit it to 75W for board power stability. You want to really pull 150W through alloy traces? With a hot running NB, CPU, and SB in close proximity? I don't.


Specs also dont mean reality, there is no way in hell any cheap board will provide 75W to a card 24/7 without causing issues.
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