CrossFireX and the Phenom II X4 940 – Competitive or Not?
by Gary Key on February 2, 2009 12:00 AM EST- Posted in
- Motherboards
Left 4 Dead
This game is a blast and addictive to boot - provided you like killing hundreds of zombies while trying to take care of your teammates and sustaining high blood pressure rates. What we really like about Source engine games is their ability to run well on variety of systems. We enable all options, set AA to 2x and AF to 8x, and play back a custom timedemo of a complete game session from the Runway chapter within the Dead Air campaign.
This title also favors the Intel platforms. When comparing the Q9550 to the Phenom II 940 at 1680x1050 it holds a 7% average frame rate advantage in single card mode, 5% in Crossfire, and 20% in the overclocked settings even though the Q9550 only has a 7% clock speed advantage. Minimum frame rates for the Phenom II remain very competitive against the Q9550 until the processors are overclocked, but a 101fps minimum is still outstanding. The i7 continues to dominate the other two solutions in benchmark results.
Adding a second card for CrossFire operation improves average frame rates by 15% and minimum frame rates by 18% for the Phenom II. The Intel Q9550 has an improvement of 13% in average frame rates and 30% in minimum frame rates. The Core i7 average frame rates improve by 16% and minimum rates increase 31%. Overclocking our processors resulted in an 17%~34% average improvement in average frame rates with the Core i7 benefiting the most.
No surprises here; the 1920x1200 results follow the pattern set at 1680x1050. All three solutions bunch together in the single card results and then spread out as we introduce CrossFire and overclocking into our equation. The Q9550 holds a 10% advantage over the Phenom II in CrossFire and 26% when overclocked. Minimum frame rates continue to be very good for the Phenom II in single card and CrossFire operation.
The Q9550 scores slightly better than the i7 in the single card and CrossFire mode as its 6% advantage in clock speeds (or perhaps the larger L2 cache) comes into play as we start to become more GPU limited at this resolution. The Phenom II has a 6% clock speed advantage over the Q9550 and a 12% advantage over the i7 that leads us to believe platform efficiency is a problem or the game engine optimizations favor Intel. We believe it is a combination of both.
Adding a second card for CrossFire operation improves average frame rates by 13% and minimum frame rates by 42% for the Phenom II. The Intel Q9550 has an improvement of 24% in average frame rates and 40% in minimum frame rates. The Core i7 average frame rates improve by 24% and minimum rates increase 48%. Overclocking our processors resulted in a 16%~34% average improvement in average frame rates with the Core i7 benefiting the greatest.
Our game play experiences revealed no differences between the three platforms. Although the frame rates were lower with the Phenom II, it just did not matter in this game as minimum frame rates were at 60fps or higher in our tests.
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jrch2k8 - Monday, February 2, 2009 - link
first of all, nice article. i mention it cuz im upgrading my pc this month and this article make my choice clear XDi will go for a AMD plataform, my god nice move from these guyz, i think p2 is the best price/performance cpu around (maybe ill wait for p2 925 for ddr3).cuz i7 is a really expensive upgrade.
i went to new egg and add to my cart 1 cpu, ram, and 2 radeon hd 4850 using mid range components nothing top notch
intel i920 6gb ddr3 tc roughly 1108$ :(
intel 1940 "" "" roughly 1350$ :( :(
amd p2 920 4 gb ddr2 dc nice 673$
amd p2 940 "" " " nice nice 713$
amd p2 940 "" "" 4870 CF 800$ XD
that is a hugeeeee money diff for a 30% perf diff at most and with that extra bucks put a nice air cooling and OC so ... and you dont need to worry too much in near future like with intel and their insane socket change every 2 weeks (i know 775 have been for a while but even if is the same physical socket every mobo/chpset need a specific cpu number so is like changing the socket anyway)
and with linux and not winbloat vista perf is going to be hell better and winxp in my other hd ofc for some game that doesnt work with wine XD
ssj4Gogeta - Monday, February 2, 2009 - link
Most mobos support Core 2 Duo, Quad, and Pentium dual core processors (i.e., all core-based processors). So I don't think it is a valid argument.raystormer - Monday, February 2, 2009 - link
first of all to me the fx chipset is old compared to the new 790gx /w 750southbridge chipset plus it supports crossfire which u mention the 790fx is suppose to be better,don;t know how u came to that conclusion furthermore something about those scores do'nt seem right...cause i have seen beachmarks with the phenon 2 smoking the i7 920 @3.6...so u trying to tell me that @3.9 it performs slower bull$%#@ssj4Gogeta - Monday, February 2, 2009 - link
the i7 was also overclocked. read the article.BLaber - Monday, February 2, 2009 - link
What was the Phenom II's North Bridge Uncore part) speed set to when oc to 3.9Ghz in above article.TDMFHK - Monday, February 2, 2009 - link
http://www.legionhardware.com/document.php?id=802&...">http://www.legionhardware.com/document.php?id=802&... how the PII is on top in their test (i know other video card etc etc... but how ??????????).Something is fishy with this FarCry2.Goty - Monday, February 2, 2009 - link
You really can't compare the two sets of results since the system specs aren't the same.m4dd0g - Monday, February 2, 2009 - link
Any chance of seeing how the phenom acts with 6gb RAM like the top intel box? Not sure why you had different memory configs there, I understand its DDR3 v DDR2 but why more of it?Goty - Monday, February 2, 2009 - link
The i7 supports triple-channel DDR3 while the other processors support dual-channel DDR2, so the normal memory configurations are 3GB or 6GB for the i7 and 2GB or 4GB for the C2Q and PHII.Getting 6GB on the PHII system would be a little dumb because you'd have to go with 3x2GB DIMMs (just like the i7 box) and then you wouldn't be able to operate in dual-channel mode.
I highly doubt the performance difference between 6GB and 4GB of RAM is noticeable anyway.
niva - Tuesday, February 3, 2009 - link
I've been wondering the same...Even more bothersome is that they chose 4gb for the DDR2 system which makes no sense, for an equivalently priced system you can afford 8Gb of RAM on the AMD system easily and gain a significant boost out of the extra RAM. So if any one of these systems should have a disadvantage in RAM it should be the intel system but whatever.
I'm running an original phenom with 8 gigs, the chip with the errata which I've never seen manifest. I'll buy one of these phenom 2 chips after I get back from my trip to Russia in March though and actually do a slight OC on it as it seems to take it so well.
Cheers!