Higher Clock Speeds, No TLB Issues and Better Pricing: The New Phenom
by Anand Lal Shimpi on March 27, 2008 12:00 AM EST- Posted in
- CPUs
The Test
CPU: | AMD Phenom 9850 (2.5GHz) AMD Phenom 9750 (2.4GHz) AMD Phenom 9550 (2.2GHz) AMD Phenom 9600 (2.3GHz) AMD Phenom 9500 (2.2GHz) Intel Core 2 Quad Q9300 (2.50GHz/1333MHz) Intel Core 2 Quad Q6600 (2.40GHz/1066MHz) Intel Core 2 Duo E8200 (2.66GHz/1333MHz) Intel Core 2 Duo E6750 (2.66GHz/1333MHz) |
Motherboard: | ASUS P5E3 Deluxe (X38) MSI K9A2 Platinum (790FX) |
Chipset: | Intel X38 AMD 790FX |
Chipset Drivers: | Intel 8.1.1.1010 (Intel) AMD Catalyst 8.3 |
Hard Disk: | Western Digital Raptor 150GB |
Memory: | Corsair XMS2 DDR2-800 4-4-4-12 (1GB x 2) Corsair XMS3 DDR3-1066 7-7-7-20 (1GB x 2) |
Video Card: | eVGA GeForce 8800 GT SSC |
Video Drivers: | NVIDIA ForceWare 169.25 |
Desktop Resolution: | 1920 x 1200 |
OS: | Windows Vista Ultimate 32-bit |
Our Stance on Testing with the TLB Bug
The B2 stepping Phenoms suffer from the infamous TLB erratum which, if left unpatched, could potentially result in system instability or silent data corruption. Thus far AMD has only seen negative after effects from unpatched B2 processors in very isolated cases, described to AnandTech as the following:
1) Windows Vista 64-bit running SPEC CPU 2006
2) Xen Hypervisor running Windows XP and an unknown configuration of applications
While these are both isolated cases, they are by no means the only scenarios in which the TLB bug could rear its ugly head. All of the latest Socket-AM2+ motherboards have been updated to fix the TLB bug, at the expense of sometimes significant performance degradation. The table below summarizes our findings in our initial B3 stepping article:
SYSMark 2007 | DivX | CineBench R10 | 3dsmax 9 | WinRAR | |
AMD Phenom 9600 (B2 Stepping) - TLB Fix Disabled | 117 | 74.3 fps | 7396 | 7.20 | 1348 KB/s |
AMD Phenom 9600 (B2 Stepping) - TLB Fix Enabled | 105 | 72.0 fps | 7031 | 6.47 | 367 KB/s |
Performance Impact | -10.3% | -3.1% | -4.9% | -10.1% | -72.8% |
Since the bug could prove to be a problem in usage scenarios that haven't yet been discovered, we feel that it's best to test these B2 stepping chips with the TLB fix enabled (the default state on all motherboards now). Obviously this doesn't impact the new xx50 CPUs since they aren't plagued by the TLB erratum.
65 Comments
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chizow - Thursday, March 27, 2008 - link
I kinda agree with the others about this being a massive fluff piece. The following take on clock speeds really emphasizes the bias built into this article, about Phenom's clock speeds and potential performance:and on the very next page:
There isn't anything special about 3GHz, AMD just can't get this hot turd to run that fast, period.
pomaikai - Thursday, March 27, 2008 - link
Just bought a phenom for an upgrade. It is the old stepping, but the person I got it for will never do virtualization or overclock. I couldnt pass up an OEM Phenom 9600 for $132.Dribble - Thursday, March 27, 2008 - link
I agree Q9300 is no Q6600 replacement because the whole point of the Q6600 was you could over clock it to get a real high performance part. Because the Q9300 uses the 333 fsb trying to get over clocks similar to even the Q6600 requires a much higher fsb. Particularly as the max fsb for a quad is significantly lower then for dual's, you'll max out most motherboards before you even reach the max possible Q6600 speeds.coldpower27 - Thursday, March 27, 2008 - link
Q9300 is a reaplcement if your not an overclocker it has better stock perfomrance and to most of intel's OEM's it is, so overall it is a better. From both a stock performance and energy consumption standpoint.If your trying to overclock you will likely need at least the Q9450.
7Enigma - Thursday, March 27, 2008 - link
I have been waiting to build a system now for a couple months and I really wanted to use the 9450 due to the 12mb cache compared to the Q9300. The newegg out of stock price, however, is listed at $380!!!My price sweetspot for a CPU has always been around $300 since I only upgrade systems every 3-4 years so am willing to spend more on the cpu than other components.
Anand, do you happen to have a comparison between the 9450 and 9300 (preferably at the same clock speed?) to see exactly how much that doubling of L2 cache helps in different situations. I primarily game, but always multitask and have other programs running so would really like to know if that extra 6mb is helpful (especially in the next 3 years).
Thanks.
archcommus - Thursday, March 27, 2008 - link
My situation exactly. I was hoping to build a new system first week of May with a 9450, due to wanting a quad-core 45nm part with the best cache/price ratio, but it doesn't look like it will be affordable by that time (I'm willing to pay $316, not more though). So I too am curious if the 9300 will fit the bill (also planning to keep for 3-4 years).DigitalFreak - Thursday, March 27, 2008 - link
AMD still make stinky stinky. Pew!formulav8 - Friday, March 28, 2008 - link
Grow up. Intel doesn't like you.Proteusza - Thursday, March 27, 2008 - link
Is it all possible for you guys to release the replay which you used to test performance? I want to compare my system to these, because I'm considering upgrading to Phenom. Pity MSI hasnt released a BIOS update for my motherboard that allows it to use Phenom CPUs, so I might be waiting a while (its a K9N SLI Platinum, in future I will just buy Asus).Note to anyone who plays Supreme Commander with a multicore CPU - there is a tool that improves performance by allocating threads to CPUs better. It is specific to SupCom, which tends to have one CPU with 100% usage, and the rest with 20%. The tool automatically adjusts the affinity. Go to forums.gaspowered.com and look in around for a thread related to Core Maximizer.
michal1980 - Thursday, March 27, 2008 - link
Ok amd is doing better. The Q6600 has been out for what? over a year now. And its still owning AMD's baby. And to top that off, I though the whole 'pure' quad core technology was supposd to be better then the lets slap 2 dual cores into one package method of Intel.Its nice Amd can FINALLY start to play with the big boys... But the way this article was written is just garbage, A year late and a dollar short.
As for price the q6600 is dropping all over the place... Frys had it for 180 yesterday, Microcenter has it for 200.
So why is this article written in such postive light for AMD? A nice paycheck for the author. The conclusion is clear... Intel OWNS AMD. The price difference on the market is 0. The ability to overclock the q6600 is as easy as switching the bus to 1333mhz, and the ownage will grow.
So yes amd made an improvemnt over the crap they had. However their current cream of the crop is owned by the 1+ year old stuff.
Its like getting into the hotest club right before they close... Wow you got in... But its time to go.