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AMD Phenom 9950 to dissipate 140W

@ 2008/04/15

We’ve learned that soon-to-launch Phenom 9950 will dissipate 140W. The motherboard manufacturers are currently testing their boards to see if they can take it, but most of the boards that can cope with 125W will be able to take care of 140W.

Once you overclock your 125W TDB Phenom 9850 your TDP jumps up anyway, and the board that will let Phenom 9850 overclock will also take good care of Phenom 9950.

Comment from jmke @ 2008/05/03

psssst

http://www.madshrimps.be/vbulletin/f...-9850be-43880/

Comment from geoffrey @ 2008/05/03

Quote:

As a recap, the critical aspect of running a 9850BE at stock speeds on current 780G products centers on the cooling of the PWM circuitry. Each and every manufacturer along with AMD agreed that cooling the MOSFETS properly was critical to the successful operation of the board at stock or overclocked speeds with the 9850BE - and to some degree, the 6400+ X2.

http://www.anandtech.com/mb/showdoc.aspx?i=3299&p=1

Comment from geoffrey @ 2008/04/16

A higher number of phase nodes will make each node run cooler, but it does not directly mean that more phase nodes is better in providing more current.
The boards tested at Anand are brought to the edge of stability just so to remain cheaper? They should have added heatsinks, how many 100€ Intel boards come heatsink-less?

Just in case, AMD brought out a high power CPU but it is not directly their fault that the lower end boards are being killed on sight.

Comment from Kougar @ 2008/04/16

Hot running or dusty case, or high ambient temp would still cause problems! They still had one crash even with the fan, not good. Also that was with the "improved" Gigabyte board.

Comment from jmke @ 2008/04/15

Quote:

After placing an additional case fan over the PWM/MOSFET area, our board completed three hours of OCCT, two hours of our Crysis demo looping, and over five hours of PCMark Vantage looping. We only had one shutdown of OCCT and that was at the one hour, six minute mark, but it has not occurred again.

Quote:

We have not noticed any stability or shutdown problems to date with additional cooling over the PWM/MOSFET area

seems that cooling was the issue, and testing outside a case the cause, inside a case those mobo's will stand a much better chance than outside

Comment from Kougar @ 2008/04/15

Not sure I would call $100 low end, but you may be right. Was close to high-end back in Abit IS7 / IC7 days

Anandtech did add a fan, this was the follow up: http://www.anandtech.com/weblog/showpost.aspx?i=427 Still not enough without MOSFET/PWM area heatsinks on some boards...

Comment from jmke @ 2008/04/15

most likely they tested outside case, which is not real world and might indeed be the cause; a recent motherboard tested outside a case failed when under load due to overheating, but placed inside a case with minimal airflow it was rockstable

Comment from geoffrey @ 2008/04/15

Auwch! I did miss that, thx.

9850 aka the board killer

Low-end is low-end, no matter what, but if it can't take retail processors then their is something wrong in their philosophy of board design. I do wonder, since the pictured boards don't come with heatsinked MOSFET's, has Anand tested these boards inside a housing where case airflow probable improves MOSFET temperature.

Comment from Kougar @ 2008/04/15

Quote:

Originally Posted by geoffrey

They can't feed sufficient current? Example?

Did you miss: http://www.anandtech.com/mb/showdoc.aspx?i=3279 ? 125W AMD processors were to much for 780G ~$70-100 4/5 phase motherboards. 140W 9950 would be even more of an issue.

Comment from jmke @ 2008/04/15

Quote:

Originally Posted by geoffrey

They can't feed sufficient current? Example?

they blow up

Comment from Pardons @ 2008/04/15

could this be because of the imc design??

Comment from geoffrey @ 2008/04/15

They can't feed sufficient current? Example?

Comment from Gamer @ 2008/04/15

Looks like it.
Now I know why those low cost boards die.

Comment from geoffrey @ 2008/04/15

Time for a die shrink?

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