Quote:No, that's only when using only one core. With two I'm pretty sure it *almost* keeps up with phenom.
Plus, his clock is pretty good.
That doesn't make any sense. Both bulldozer and phenom II have more than two cores. 1 core on bulldozer vs. 1 core on phenom II should produce the same performance difference as 2 cores on bulldozer vs. 2 cores on phenom II. The performance per core is still the same. Unless I'm misunderstanding your implications?
When using 1-4 threads the per core and total performance of bulldozer is inbetween an athlon II and phenom II since each thread has its own module.
When using 5-8 threads the per core performance is inbetween an athlon X2 and athlon II since each pair of threads is sharing a module.
However once you factor in the fact that it has a higher clock rate than any of those cpus the performance per clock per thread can be as low as an athlon X2 when using 8 threads. It still is faster than an 8 core K8 (athlon X2) chip clocked at 4.0 GHz would be due to better sse performance and the ability for a single thread to access the resources of two cores in a module, it just doesn't scale particularly well in either direction.
Quote:That doesn't make any sense. Both bulldozer and phenom II have more than two cores. 1 core on bulldozer vs. 1 core on phenom II should produce the same performance difference as 2 cores on bulldozer vs. 2 cores on phenom II. The performance per core is still the same. Unless I'm misunderstanding your implications?
The bulldozers use a very uncanny setup with their cores. It would take a while to explain (read the link below if you are curious) but for most multi-threaded applications, which is supposed to be it's tour de force, it actually performs worse, as programs are designed for the simpler, more traditional way of doing multiple cores, and not for the cheating methods that the Bulldozer employs. Even for programs that are optimal for it, the cheating they did doesn't provide any advantages over intel chips, not even on a bang for the buck measure.
As for comparing a Bulldozer to the Phenom II for a single core, the Phenom outperforms the Bulldozer, and the Sandy Bridges outperform both. See the link for the benchmarks.
http://www.tomshardware.com/reviews/fx-8150-zambezi-bulldozer-990fx,3043.html
Quote:As for comparing a Bulldozer to the Phenom II for a single core, the Phenom outperforms the Bulldozer, and the Sandy Bridges outperform both. See the link for the benchmarks.
I think we'd already decided this.
Thanks to all of you out there telling me that Bulldozer was essentially not going to cut it i have decided to return it and i have instead switched to an Intel i7 2700k. thank you and hopefully this will help me run all the performance intense games.
Not all ofcourse, but this is definitely an improvement over any Bulldozer CPU.
Now all you have to do is overclock it.
Concerning overclocking: Make sure, that you have a decent CPU cooler + good Thermal compound or you'll grill your CPU. And you have to always check your temperatures. (e.g. with CoreTemp or RealTemp)
(04-10-2012, 06:14 AM)NaturalViolence Wrote: [ -> ]Quote:No, that's only when using only one core. With two I'm pretty sure it *almost* keeps up with phenom.
Plus, his clock is pretty good.
That doesn't make any sense. Both bulldozer and phenom II have more than two cores. 1 core on bulldozer vs. 1 core on phenom II should produce the same performance difference as 2 cores on bulldozer vs. 2 cores on phenom II. The performance per core is still the same. Unless I'm misunderstanding your implications?
When using 1-4 threads the per core and total performance of bulldozer is inbetween an athlon II and phenom II since each thread has its own module.
When using 5-8 threads the per core performance is inbetween an athlon X2 and athlon II since each pair of threads is sharing a module.
However once you factor in the fact that it has a higher clock rate than any of those cpus the performance per clock per thread can be as low as an athlon X2 when using 8 threads. It still is faster than an 8 core K8 (athlon X2) chip clocked at 4.0 GHz would be due to better sse performance and the ability for a single thread to access the resources of two cores in a module, it just doesn't scale particularly well in either direction.
I meant that on applications that can use only one core, BD would have less performance than phenom 2, while on applications that use two+ cores it could keep up with phenom.
I'm still not sure if that is right, but that was what I meant
as far as temps go i am investing in corsair h100 liquid cooling
Quote:I meant that on applications that can use only one core, BD would have less performance than phenom 2, while on applications that use two+ cores it could keep up with phenom.
That is not correct. Relative performance between the two will stay the same if the application in question has 4 or less threads.