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AMD's Phenom X4 9950, 9350e and 9150e: Lower Prices, Voltage Tricks and Strange Behavior
AMD's Phenom X4 9950, 9350e and 9150e: Lower Prices, Voltage Tricks and Strange Behavior
Date: July 1st, 2008
Topic: CPU & Chipset
Manufacturer: AMD
Author: Anand Lal Shimpi & Gary Key
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The 140W TDP: Is Phenom the new NetBurst?

The Phenom X4 9950 Black Edition is now AMD's hottest microprocessor, carrying a 140W TDP up from 125W of the 9850 and retail 9750. The 15W bump in TDP is all for a meager 4% increase in clock frequency. The question is: does this translate into a significantly higher increase in system power consumption?

  Idle Load (Cinebench XCPU) Vcc
AMD Phenom X4 9950 (140W TDP) 188W 279W 1.312V
AMD Phenom X4 9850 (125W TDP) 204W 297W 1.312V

 

Surprisingly enough, our 9950 sample actually used less power than our 9850. We first checked to see if they both ran on the same VID and indeed they did: 1.312V for both.

There is some power variation between CPUs, even at the same voltage, so you should definitely not assume that the 140W TDP immediately insinuates a significantly higher power draw. At the same time, AMD didn't up the rating for no reason, and it's quite possible that on average the 140W TDP processors will consume noticeably more power than their 125W counterparts.

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37 Comments - Last by pringlep0, 481 days ago
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this is stupid by skiboysteve, 507 days ago
why are you using 780G to overclock and check stability on the same article you say how someone else wrote an article about how that is a bad idea because of power...

you even say at the bottom of your overclocking page, a mere footnote, that you got higher clocks on a different platform

Reply
umm.... by acejj26, 507 days ago
what's a seccond?
why didn't you include the 9950 in the first page of benchmarks?
is the 9960 a new processor from AMD?

i've come to expect these errors from other staff writers, but not you Anand.

Reply
LOL by DigitalFreak, 507 days ago
AMD post X2 = ROFLMAO

The C&Q thing is probably another respin waiting to happen. What a bunch of boobs.

Reply
Wheres the 9950BE overclocking by Sylvanas, 507 days ago
Wheres the 9950BE overclocking results? It is an unlocked CPU so what about Overclocking the NB? What performance difference does that bring? I doubt people that buy IGP's are going to overclocking much anyway since they are usually silent HTPC rigs...

Reply
RE: Wheres the 9950BE overclocking by Gary Key, 507 days ago
The 9950BE overclocking results are coming in a different article. Unfortunately, our 790FX boards (they have been beat on for six months) were not exactly up to speed and we thought it would be better to not show anything instead of a 2.8GHz clock that obviously is not representative of the processor at this point.

Also, most of our previous results were run on the 780G, a chipset that when tuned correctly and on a good board will outclock the 790FX with a discreet graphics card by the way. Jetway just released a fairly comprehensive BIOS for their new 780G we ended up using after the others started failing. We just received BIOS updates for the 780a boards and have a new 790FX/SB750 arriving shortly for a CF/SLI update on AMD (gaming is not that bad by the way on the Phenom for the mid-range market).

Increasing the NB core (IMC) clock (in Phenom it runs async from the Core Speed unlike Athlon which is Sync) drops latencies (especially L3) and increases memory performance/throughput, which in turn improves system performance. The Phenom starts to come to life when you hit a 2.6GHz core speed with a NB core clock at 2200MHz+. Depending on the application and CPU, increasing NB core speeds (getting up to 2200MHz+) can result in performance differences from 3%~12% in most cases.

Almost as important is increasing HT speed for further optimizing the pipeline links (CPU/Memory/PCIe,etc). Our 9950BE follow up will have an overclocking guide along with optimization details.

Reply
RE: Wheres the 9950BE overclocking by Sylvanas, 507 days ago
Excellent, thanks for the info Gary- I look forward to the follow up 9950BE overclocking article. If there is some info on the SB750 aswell that's even better :)

Reply
dang! is the phenom even a good budget choice? by RamarC, 507 days ago
i'm a developer and want to upgrade my win2k3/ss2k5 server to a quad core. since it currently has a 3.4ghz p4d, a phenom 9x50 would be a big step-up (even though i don't have any performance issues). but the p4d has been very reliable and i don't want to have to deal with flaky hardware issues when i'm pushing code out the door. should i just bite the bullet and shell out the extra cash for a p45+q9450?

Reply
RE: dang! is the phenom even a good budget choice? by Calin, 507 days ago
I have an AMD based PC at home, and I look forward to another AMD-based pc (780G and Phenom X3 or X4).
These being said, I think for a server you really really should go for an Intel configuration. Also, at 3.4 GHz a P4D probably is one hell of a power draw.
Compared to your current server, and based on what I think you need, I don't think a quad core would help you - a dual core would probably be enough, and Intel has those aplenty.

Reply
RE: dang! is the phenom even a good budget choice? by Zoomer, 506 days ago
From the article, it seems like sticking to the cheaper, sub 100W TDP cpus and not overclocking is the way to go.

Reply
HT speed by Rhoxed, 507 days ago
Increasing the NB core (IMC) clock (in Phenom it runs async from the Core Speed unlike Athlon which is Sync) drops latencies (especially L3) and increases memory performance/throughput, which in turn improves system performance. The Phenom starts to come to life when you hit a 2.6GHz core speed with a NB core clock at 2200MHz+. Depending on the application and CPU, increasing NB core speeds (getting up to 2200MHz+) can result in performance differences from 3%~12% in most cases.

Upping my NB/HT to 2400MHz over the stock 2000 at the same clockspeed (2800) i net a 15%~ increase (on a 9850BE)

Reply
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