Page 3 of 3 FirstFirst 123
Results 21 to 24 of 24

Thread: X-Mas 2011: What did you get/are you playing?

  1. #21
    code_glitch, thanks a lot for suggestions!

    Quote Originally Posted by code_glitch View Post
    + Next Gen performance
    - Expensive
    - Upgrade path is... 'Murky'? LGA1366, P67 etc etc etc. Intel likes change. a lot.
    +/- Can run hot...
    I actually have doubts about Core i7 for desktop because Core i7 840qm on my Dell laptop with DDR3 at 1333 Mhz is unimpressive. I'm getting mostly the same performance in WinRAR as my desktop machine (Q6600 with DDR2 at 800 Mhz), although in 1-threaded applications it is faster because of Turbo boost.

    So AMD FX series are not that great after all? Maybe I should just wait for something better to come out or for prices to drop...

  2. #22
    PGD Staff code_glitch's Avatar
    Join Date
    Oct 2009
    UK (England, the bigger bit)
    Blog Entries
    AMD FX series are not that great after all?
    This is a touchy one and it has to do with the way bulldozer works. the FX 8 series is commonly thought to have 8 CORES. This is NOT the case.It has 8 MODULES, each is capable of handling one thread, but 2 modules share a few common components. If applications are not optimized you can have threads fighting for some resources that are shared while there are stacks of other available. Hence leading to sub-optimal performance in some scenarios.

    HOWEVER - the FX8150 for example is not bad. Its just not as good as what was hyped, fact is that when you get that chip with all 8 threads running it can knock the living daylights out of just about anything else and the reason why is this:

    Traditional 4 core (eg c2q, phenom ii x4...) have 4 cores, each with 1 set of resources each handling 1 thread.
    Hyperthreaded 4 cores (eg i5s and i7s) have 4 cores, each with 1 set of resources each handling 2 threads
    the FX and bulldozer chips have 4 cores - split into 8 modules. Each module has mostly separate resources, and some shared. In this sense it half way between true 8 coreness and 4 core hyperthreadedness.

    Now, there is a controversy involved: Windows. A patch was released after MS found that I/O scheduling on the NT kernel did not scale well to this architecture and caused lots of performance losses. They then released a patch to attempt to fix this. HOWEVER this patch had to be withdrawn as it caused the kernel to become unstable. In other words, FX8150 - above a phenom ii x4 and x6 and somewhere between a really high end OCed i5 and mid-high end i7 however I hear intel is releasing another generation of i7s so I can't say for sure yet.

    There is one thing you should consider though: a phenom ii x4 955 can trump a Q6600 at stock speeds. A phenom ii x6 will swamp a phenom ii x4 and a FX8150 will be up to 5% below a phenom ii x4 (from early reviews) in some tests and around 50% ahead of a phenom ii x4 in others. The problem with bulldozer is that its such a modern architecture virtually no code is optimized for it :|

    I'll let you decide - but for the money the high end p ii X4s and X6s are amazing. Hell, even my ahtlon ii x3 is knocking on the door of i5s so you can;t go wrong I guess. Although for the bulldozer and FX scene, I think a LOT of people are going to be waiting for piledriver with phenom iis and athlon iis in their rigs for now.

    A useful page you could use when looking at things would be this:

    Your c2q is the nice red box, look above and that SHOULD be better, your choice. I'm sorry for the long replies its just that I spent around 2 weeks non stop looking for info for my decision and things aren't as simple as they once where since bulldozer hit the scene...

    PS. If you get an X6 or X4 with a t in the name eg (X6 1066t or x4 960t) it means it has turbo. And what are you going to be using it for?
    PPS: Also worth noting - for AMD chips, hypertransport and ram speeds mean a LOT more than for intel. 1600MhZ ram FTW! Windows Experience Index is 7.2 of a max 7.9 for my RAM so I'm happy, you can't get much higher (says windows)
    Last edited by code_glitch; 03-01-2012 at 08:51 PM.
    I once tried to change the world. But they wouldn't give me the source code. Damned evil cunning.

  3. #23
    to code_glitch: again, thank you for such detailed explanation!

    So it seems that AMD FX CPUs vs Intel are in a way similar to AMD GPUs vs Nvidia, where AMD usually have much more processor units but with more limited capabilities. I also can't help but notice that there are many more models of CPUs both for AMD and Intel these days, which makes selection much more complicated.

    Btw, do you keep the opinion that a high-end Core i7 has the highest performance? For usage patterns, sometimes I use main desktop for gaming, but most of the time it's used with Delphi IDE, and for executing multi-threaded research apps.

    From what I've seen, WEI (windows experience index) usually takes into account the amount of RAM instead of its speed. Also, for some reason on most machines I've tried in Win7 the RAM score corresponds exactly to CPU score. Do AMD chips have hypertransport bus higher or equal to 1600 Mhz? Because for Intel it still seems to be limited to 1333 Mhz even in Core i7 chips. Also, how's the latency in 1600 Mhz RAM for random memory access?

  4. #24
    I know that this is an old topic, but wanted to comment that I've finally decided to go for Intel and acquired Core i7 2600K. The budget got very restrictive, so I've got Asus P8H61 mobo and cheap RAM (will get better parts later on). The original Intel cooler was too crappy so I've used CoolerMaster Vortex Plus (even though I don't like it due to large gaps between heatsink and heatpipes on the side touching the CPU). Anyway, the performance is roughly 3 times of my Q6600 and 2 times of my mobile i7 840QM.

    However, even though Core i7 2600K has lower thermal profile of 95W when compared to Q6600 having 105W, it runs significantly hotter in stress tests.

Page 3 of 3 FirstFirst 123

Tags for this Thread


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Comodo SSL