Originally Posted by HourBeforeDawn I also disagree that the problem isnt the memory, It would seem to me that is the memory is its bottleneck when you look at all the test results. Besides more people will be going for AMD soon enough with how bad the world economy is going unless Intel drops prices, you can pretty much build a kickass AMD system that will play all the games and do all your work for a lot less then what you can do with an Intel setup.
Not at all.
Intel Core i7 does not benefit from even dual channel that much let alone tri-channel ddr3 1066. AMD doesn't benefit from 1333 DDR3 over 1066 DDR2 - otherwise we'd be recommending AM3 CPUs and motherboards, which, we're not. AMD stated itself DDR3 at most accounts for a 5% performance advantage over DDR2 - it's deliberately left DDR3 this late because of the high price and small performance margin.
AM3 has a large L3 cache and DDR3 has a higher latency than DDR2 (C7 versus C5 often) and generally the performance of its memory controller is slow at 2GHz. I'd also say that at this stage the fact it's got exclusive cache is also a hinderance compared to Intel's inclusive which acts as a snoop filter. Exclusive was good in the days of small cache because of a very limited transistor budget - these days we're hitting a billion transistors and nearly 10s of MB so optimising IPC and traffic flow should be the ultimate goal for performance and heat.
AMD's weakness is its execution engine - which it designed back for K8 and has only made slightly wider to accommodate better SSE, and tweaked other parts for better virtualisation and a tailoring to use the L3 cache, but underneath, it's no wider superscaler architecture, it's IPC is no better and it doesn't have multiple instruction issue let alone multi-threading on a per-core basis afaik.
Comments 26 to 27 of 27
ReplyNot at all.
Intel Core i7 does not benefit from even dual channel that much let alone tri-channel ddr3 1066. AMD doesn't benefit from 1333 DDR3 over 1066 DDR2 - otherwise we'd be recommending AM3 CPUs and motherboards, which, we're not. AMD stated itself DDR3 at most accounts for a 5% performance advantage over DDR2 - it's deliberately left DDR3 this late because of the high price and small performance margin.
AM3 has a large L3 cache and DDR3 has a higher latency than DDR2 (C7 versus C5 often) and generally the performance of its memory controller is slow at 2GHz. I'd also say that at this stage the fact it's got exclusive cache is also a hinderance compared to Intel's inclusive which acts as a snoop filter. Exclusive was good in the days of small cache because of a very limited transistor budget - these days we're hitting a billion transistors and nearly 10s of MB so optimising IPC and traffic flow should be the ultimate goal for performance and heat.
AMD's weakness is its execution engine - which it designed back for K8 and has only made slightly wider to accommodate better SSE, and tweaked other parts for better virtualisation and a tailoring to use the L3 cache, but underneath, it's no wider superscaler architecture, it's IPC is no better and it doesn't have multiple instruction issue let alone multi-threading on a per-core basis afaik.
Check this http://www.techtrance.net/2009/03/pc-hardware-news/amd-scores-6ghz-on-phenom-ii-x3-720-black-edition/
Looks like Phenom II will take over C2Duo/Quad!
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