The Bulldozer Review: AMD FX-8150 Tested
by Anand Lal Shimpi on October 12, 2011 1:27 AM ESTThe Impact of Bulldozer's Pipeline
With a new branch prediction architecture and an unknown, but presumably significantly deeper pipline, I was eager to find out just how much of a burden AMD's quest for frequency had placed on Bulldozer. To do so I turned to the trusty N-Queens solver, now baked into the AIDA64 benchmark suite.
The N-Queens problem is simple. On an N x N chessboard, how do you place N queens so they cannot attack one another? Solving the problem is incredibly branch intensive, and as a result it serves as a great measure of the impact of a deeper pipeline.
The AIDA64 implementation of the N-Queens algorithm is heavily threaded, but I wanted to first get a look at single-core performance so I disabled all but a single integer/fp core on Bulldozer, as well as the competing processors. I also looked at constant frequency as well as turbo enabled speeds:
Unfortunately things don't look good. Even with turbo enabled, the 3.6GHz Bulldozer part needs another 25% higher frequency to equal a 3.6GHz Phenom II X4. Even a 3.3GHz Phenom II X6 does better here. Without being fully aware of the optimizations at work in AIDA64 I wouldn't put too much focus on Sandy Bridge's performance here, but Intel is widely known for focusing on branch prediction performance.
If we let the N-Queens benchmark scale to all available threads, the performance issues are easily masked by throwing more threads at the problem:
However it is quite clear that for single or lightly threaded operations that are branch heavy, Bulldozer will be in for a fight.
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dingetje - Wednesday, October 12, 2011 - link
i agree with some that bulldozer is more like faildozer, but...let's keep supporting amd so the one getting piledrive'd in the naughty place will not be you when intel has zero competition left because you did not want to spend a little more for a little less....and let's be honest, it IS just a little.
if enough ppl drop amd, in the end WE will be the one paying for amd's lack of support.
at least amd is trying.....the question is, what are YOU going to do to stop intel becoming your bunghole-piledriving overlord?
wolfman3k5 - Wednesday, October 12, 2011 - link
Supporting incompetence is like socialism (or even communism). Eventually those that are supported will sit around like dogs all day and do nothing but lick their hairy balls...dingetje - Wednesday, October 12, 2011 - link
ah...someone has been brainwashed by watching to much fox news.communism baaaad boogabooga!! ....duhhhhh lol roflmao
sure, capitalism works...however, it only works when there actually IS competition.
i wish your (most likely already loose) rectum good luck.
wolfman3k5 - Wednesday, October 12, 2011 - link
Apparently money won't motivate the Monkey Engineers at AMD, so maybe making fun of them will. I mean, where is their pride, right?By the way, I've seen real socialism, so I have a clue what it is. And it is what I just described. I don't like Intel because they are not healthy for our economy, yet their only competition just pulled a gigantic fuck-up.
dingetje - Wednesday, October 12, 2011 - link
oooooo oooga boooga socialism is bad....it take away aaalll you money...it verrry baddd.....oooooogabooogaboooo!! LOLhave fun getting eaten alive by china after your capitalistic model became cancerous and will die from the inside out.
your country is bought and paid for and will be eaten alive by the "communistic" chinese who are in fact just the same as what the usa has become: a corporate dictatorship (not communism and certainly not socialism).
sorry, i didnt mean to scare you more than you obviously already are.
i would send you some lube to easy the pain, but i'm all out ;)
UberApfel - Wednesday, October 12, 2011 - link
My god you're all so retarded...Dingetje; China has serious issues when it comes to the welfare of their people. China only owns 10% of our debt, and that is thanks to China becoming capitalistic as a nation.
Wolfman; Bulldozer is a server procressor. The server market is where the money is especially with the cloud and enthusiast-class desktops becoming rare. Intel has 30X AMD's market capital... they can afford to target multiple markets. AMD can't.
Bulldozer is superior with integer processing in both performance-per-core and performance-per-watt. Of course; I do wonder why desktop applications even need floating point... (numbers < -2^63 or > 2^63)
hasu - Wednesday, October 12, 2011 - link
Like wise... killing or trying to control competition is also communism.radium69 - Wednesday, October 12, 2011 - link
Jeebus, that power consumption is going through the roof!Also there were some rumors that it would go up to 8Ghz, I wonder if would use a Kw by then...
I want to see how they compare to each other when overclocked to 4,5 or more or less.
Also Anand, can you do a efficiency test? Various overclocking speeds and bench these while monitoring the power consumption. Might make an interesting article :)
ypsylon - Wednesday, October 12, 2011 - link
Not really - even including AMD fanboys. AMD can't understand that to move forward you must abolish old stuff for good. Brand new and spanking Bulldozer has it roots in ancient K6. Do something new for crying out loud or get lost and stop wasting time. Don't release CPUs just for the sake of offering something. That is not the point of CPU market. Even Intel can shoot themselves in the foot with X79. Looks like it will be similar failure to FailDozer. Nobody will invest in entirely new platform for 10 maybe 15% performance boost over X58 which is the new 775 socket. Long live the S1366! Plenty of life and fuel left in Nehalems, plenty... If you wanted to buy Bulldozer then go and buy X58 platform. After nearly 4 years on the market it is [somewhat ;)] dirt cheap.Anand one thing: I find it puzzling that you reckon that Bulldozer will do well in server environments. With that kind of performance/Watt and inefficient power management? No chance in hell. i7/Xenons will eat FailDozers for breakfast.
wolfman3k5 - Wednesday, October 12, 2011 - link
I'm not. I completely agree with everything that you've said.And, if I might add: Dear AMD, and dear AMD engineers (and lazy fucks that you are), throwing more cache at an already inefficient architecture is not going to solve your problem. Add to that that you people (yes, you AMD people) are calling a 4 Core CPU an 8 Core because you've added another Integer Unit to each core. WTF?! That's almost like calling a quad core Intel 2600K and 8 Core CPU because it has Hyper Threading.
I have been an avid AMD supporter since 1996. I have spent many thousands of dollars on your CPUs and other hardware that you people make. I'm done. Not another penny! Ever!