Does AM2 Reduce the Impact of L2 Cache Size?

We've already seen that Socket-AM2 doesn't really impact performance except for in games, but does the higher bandwidth memory controller reduce the impact of AMD's 1MB L2 cache parts compared to its 512KB L2 cache offerings? 

 Benchmark - Athlon 64 X2 2.0GHz Socket-939 (1MB vs. 512KB Advantage)  Socket-AM2 (1MB vs. 512KB Advantage)
Cinebench 9.5 Multi-Core Rendering Test 0.2% 0%
3dsmax 7 0.3% 0.6%
Adobe Photoshop CS2 2.7% 2.5%
DivX 6.1 0% 0%
WME9 0% 1%
Quicktime 7.0.4 (H.264) 0.9% 1.3%
iTunes 6.0.1.4 (MP3) 0% 0%
Quake 4 - 10x7 (SMP) 4.8% 3.5%
Oblivion - 10x7 7.5% 3.3%
F.E.A.R. - 10x7 8.6% 6.2%

 

In the application benchmarks there isn't really a difference in how performance scales with cache size between the two platforms, but looking at the games there is indication of a pattern that is developing.

In Quake 4, Oblivion and F.E.A.R. the 1MB L2 cache seems to make slightly more of a difference on the Socket-939 platform than on the Socket-AM2 platform.  While the 1MB cache offers a 4.8%, 7.5% and 8.6% performance advantage in those three games on the Socket-939 platform, on AM2 the advantage is cut down to 3.5%, 3.3% and 6.2% respectively.  The explanation being that with a lower latency memory controller and more available memory bandwidth, the benefits of a larger cache are reduced on Socket-AM2. 

However the differences in performance scaling that we're seeing here are small enough that once you take into account the amount of variation you can see between runs, it's not really worth concluding anything concrete based on this data.  What we do see here is a trend of the 1MB L2 cache parts doing less on Socket-AM2 than on Socket-939 (another way of looking at it is that the 512KB are doing better on AM2 than they did on 939), but the margins are small enough that we can't really say for sure what is causing the trend.

Once again, the trend only seems to impact games, as the other application tests we've run appear to be basically unaffected. 

The Question on Everyone's Mind: Is AM2 Faster? How Does the New 4000+ Stack Up?
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  • Slappi - Thursday, May 25, 2006 - link

    That is the real question.

    Very biased these last few months.

    I sure hope Conroe can cook dinner and clean my house because if it can't someone has some explaining to do.
    Reply
  • lewisc - Thursday, May 25, 2006 - link

    How was that review at all biased? AM2 showed very very small improvements over socket 939, Anand said so. Is it biased because the result was not what you wanted? How you could possibly suggest buying a a new platform that has hardly any improvement over a predecessor is beyond me. Reply
  • Slappi - Thursday, May 25, 2006 - link

    Just all his talk about Intel the last few months has been really biased. Not necessarily this article.

    Just my opinion and I really like this site it just seems like someone is being taken care of.

    I could be wrong.
    Reply
  • clnee55 - Friday, May 26, 2006 - link

    I agree in the last few months, AMD has shown that it doesn't have anything ready to compete with Conroe. I certainly can trust Anand's analysis. Your conspiracy theory is full of it.

    By the way, just how much AMD stock do you own?

    Reply
  • EdisonStarfire - Thursday, May 25, 2006 - link

    I've owned AMD systems since 1998 starting with an Athlon 600 OEM. I've built several other AMD systems since then. Sure, there is a slight chance Intel had some influence on their test systems anand tested but from seeing other pre-release samples around the web I think its just a case of Intel finally waking up and building a good cpu. I hope AMD has a good answer but if they don't and fooled themselves into thinking Intel didn't have the resources or need to build something (like alot of fanboys do) then they were kidding themselves badly. If the Core 2 Duo chips are the best out when its time to dump my X2 4400 then thats what I will be buying. I know AMD is limited in resources but the Dothan should have been a sign of what was coming and made some revisions with the AM2 release. Let's hope the deerhound cores improvements add about 20% IPC so can keep some good competition going between the two companies.

    in short... I don't think Anand is being biased about anything. Just my 2 cents.
    Reply
  • Thatguy97 - Friday, May 01, 2015 - link

    well it sure did and amds dying Reply
  • Thatguy97 - Tuesday, December 27, 2016 - link

    Ayyyyy things looking up Reply
  • peternelson - Wednesday, May 24, 2006 - link


    I am interested in the changes from 939 to AM2/940 and opteron/940 and SocketF/1207

    I would like detailed PINOUTS for these.

    eg how many pins are GND, how many power / core power, how many ddr, how many ddr2, how many hypertransport links.

    Ideally full pinout not just summary by group function.

    Is this information available anywhere or would I have to/my company have to sign an NDA with AMD to obtain it?
    Reply
  • ultraCODE - Wednesday, May 24, 2006 - link

    Have anyone managed to benchmark new AM2 platform with RightMark RMMA? It shows the real peak speed (I don't trust crappy Sandra) for mem. read/write. Any results highly appreciated. Thanks in advance!
    Best wishes,
    uC
    Reply
  • jmke - Wednesday, May 24, 2006 - link

    here ya go

    quote:

    Dual-Channel DDR2-800 on AMD Athlon 64 X2 "AM2" — the First Test Results of the New Integrated Memory Controller in RightMark Memory Analyzer


    http://www.digit-life.com/articles2/mainboard/ddr2...">http://www.digit-life.com/articles2/mainboard/ddr2...
    Reply

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