AMD Phenom II X4 940 & 920: A True Return to Competition
by Anand Lal Shimpi on January 8, 2009 12:00 AM EST- Posted in
- CPUs
Final Words
Architecturally, Phenom II is what the original Phenom should have been. It's not cache starved, and while not as balanced as Core i7, it's a step in the right direction.
Compared to the Core 2 Quad Q9400, the Phenom II X4 940 is clearly the better pick. While it's not faster across the board, more often than not the 940 is equal to or faster than the Q9400. If Intel can drop the price of the Core 2 Quad Q9550 to the same price as the Phenom II X4 940 then the recommendation goes back to Intel. The Q9550 is generally faster than the 940, more overclockable at lower voltages, and a high enough default clock speed to keep you happy in the long run.
The same goes for the Phenom II X4 920 vs. Q9300/Q8200; AMD wins that comparison at the same price point. Compared to the Q9400, the Phenom II X4 920 falls behind. The Q9400 is the better buy of the two, but only if Intel does come through with rumored price cuts. We'll know for sure by the end of the month.
AMD also thankfully produced a good overclocker, at least with our review samples. The fact that we weren't able to overclock too high without increasing the core voltage is a testament to the early nature of AMD's 45nm process. Core i7, on the other hand, was basically able to reach maximum clock speed without so much as touching the voltage dials. Remember that Core i7 is Intel's second 45nm processor while Phenom II is AMD's first; it will only get better with time.
Looking through the performance results, it's also worthwhile to recognize just how fast Intel's Core i7 is. Across the board Core i7 is the fastest thing out there. If the motherboard guys could get X58 board pricing down below $200 and DDR3 memory was available at the same price as DDR2, then the i7-920 would be the clear recommendation. The entry-level Core i7 is pretty much faster than the-top end Core 2 Extreme or the Phenom II. When I originally reviewed Conroe I wrote that it was the world's fastest microprocessor; Core i7 continues to hang on to that title.
Despite Intel's strengths, AMD was able to do very well here today with Phenom II. Being able to have a CPU competitive with Penryn right out of the gates is worthy of a commendation. The scary part is that Intel could easily mitigate AMD's gains here with some simple price adjustments. Even more worrisome for AMD is that Phenom II is its only foot forward until 2011 when the first Bulldozer based CPUs arrive. There's headroom in AMD's 45nm process, but what happens when Core i7 goes mainstream? We must not forget that Phenom II is competitive with a 45nm derivative of a 2+ year old architecture.
If you have a Socket-AM2+ motherboard with BIOS support for Phenom II there's no question - Phenom II is the best upgrade path for you. If you are trying to build a new system from scratch, I'd suggest waiting for either the Socket-AM3 CPUs or see what Intel does with its pricing later this month.
Phenom II is AMD's return to competition, and unlike the best the original could do, the sequel is actually worthwhile. Even if Intel drops prices to maintain control of the quad-core market, you have AMD to thank for that. It's similar to what happened in the GPU market last summer: competition keeps prices in check. Economic woes or not, both AMD and Intel are going to be fighting hard for your business this year.
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Spoelie - Thursday, January 8, 2009 - link
Only one little gripe: why was a mid-range motherboard used for the phenom while the intel processors got enthusiast versions?there IS a difference apparently: http://www.legitreviews.com/article/795/5/">http://www.legitreviews.com/article/795/5/
Not that it would change the conclusions.
melgross - Thursday, January 8, 2009 - link
"Not that it would change the conclusions. "You answered your question yourself.
duploxxx - Thursday, January 8, 2009 - link
Nice review, always my firts site to read for a review. A bit basic on oc potential but you hint there is more to come, lets hope we don't have to wait another month like we had to wait for the 790GX board reviews.I don't see why AMD launched the unicore @1.8ghz.
You are stating that it is because of yields, might be but shanghai launched @2.0-2.2. Phenom2 would scale a lot better performance wise against penryn with a 2,2GHZ NB speed. for sure on the BE part that is a real advantage against the q9400-Q9550
Is this to give the am3+ an additional performance gain when launched? Retail chips hit NB speeds of 2,4-2,6 easy, they also showed up to 3.5-3.6ghz oc on stock vcore, your oc gain was real low, perhaps you show in future oc review what phenom can actually do.
no overview of total system power consumption idle and load?
ssj4Gogeta - Thursday, January 8, 2009 - link
Since most of the people have Intel now, it'll take them only a processor upgrade if they decided to buy a better Intel processor. But if they choose to switch to AMD, they'll have to buy the mobo as well.So for *most* people, getting a Q9400 (or Q9550 if the prices drop) will cost around $270, while getting a Phenom II 940 will cost around $470. And since this is the case for the majority, I don't see Phenom II being price competitive at all.
RadnorHarkonnen - Thursday, January 8, 2009 - link
There are more people with AM2+ Motherboards than you can think of.They may not spew they writings on the forums or comment actively saying "I'm upgrading!!!".
Units shipped, i would say you r are really short sighted. And the AMD2/AMD3 compatibility is great.
KikassAssassin - Thursday, January 8, 2009 - link
Yeah, for people building new systems right now who don't want to spend the money on an expensive i7 mobo and DDR3, the Phenom II looks really nice. Intel probably isn't going to make any more LGA775 CPUs, whereas an AM2+ system might have more room for future upgrades with AM3 being backwards compatible.melgross - Thursday, January 8, 2009 - link
But if you do go the i7 route now, you won't have to upgrade for a longer time than if you go with Phenom 1. Overall costs over time will still be lower.melgross - Thursday, January 8, 2009 - link
Oops! meant Phenom 11, or course. Anyway, the higher performance vs the price is worthwhile for many people.plonk420 - Thursday, January 8, 2009 - link
ask Dark Shikari of x264 fame .. i'm sure he could tell you an approximation of Phenom's L3 cache latency... and possibly Phenom II latency soon.hameed - Thursday, January 8, 2009 - link
In the first table here http://www.anandtech.com/cpuchipsets/showdoc.aspx?...">http://www.anandtech.com/cpuchipsets/showdoc.aspx?... the percentages are hard to understand since they need to be flipped (i7 is before Quad) and btw in Cinebench the Quad advantage is 12.8% not 4.8% and the CS4 percentages are also not accurate.