So much fanboism in this thread, it's not even funny.
Xbitlabs themselves have shown in their Bulldozer review that 2 Sandy Bridge cores are about as fast as 2 Bulldozer modules at the same clocks (i.e., 2 SB cores = 4 Bulldozer cores).
Furthermore, if we look at a benchmark such as Cinebench, we can see both single-threaded and multi-threaded performance. Cinebench scales extremely well with IPC and cores. It correctly shows that Phenom II is better per clock than Bulldozer, which has been shown by Xbitlabs and many other sites.
http://www.nordichardware...dge-3770k-benchmarks.html
Single-threaded Performance
FX-8150 3.6ghz = 1.02 (100%)
Phenom II X6 1100T 3.3ghz = 1.1 (108%)
Core i5 2500K 3.3ghz = 1.38 (135%)
Core i7 2600K 3.4ghz = 1.41 (138%)
Core i7 3770K Ivy 3.5ghz = 1.65 (162%)
On average, we can expect Ivy Bridge to hold about a 50-60% advantage in single-threaded performance over current iterations of Bulldozer (i.e., games such as Starcraft 2 and SKYRIM show this "Cinebench" % lead translates extremely well when comparing Sandy Bridge to Bulldozer). We can also see that Phenom II is better on both a per core and a per clock basis than Bulldozer architecture. This again has been shown by all the major professional reviewers.
Multi-threaded performance:
Phenom II X6 1100T 3.3ghz = 5.86 (97%)
FX-8150 3.6ghz = 6.03 (100%)
Core i7 2600K 3.4ghz = 6.88 (114%)
Core i7 3770K Ivy 3.5ghz = 7.52(125%)
Again, Bulldozer can only outperform Phenom II as a result of having 8 cores and more aggressive TurboBoost when all the cores are used. Phenom II is still the moer efficient processor even under multi-threaded tasks considering it has lower clocks and only 4 cores. Compared to Intel's offerings, Bulldozer's 8 cores still cannot even match 4 Sandy Bridge cores with HT and lose badly to 4 Ivy Bridge cores with HT.
Bulldozer would need a 25% increase in frequency just to match a stock Ivy Bridge Processor in multi-threaded tasks and an unreal increase in frequency to have any shot to beat Ivy Bridge in applications that use 1-4 threads only (something that won't happen on any refined 32nm process).
Now, even if AMD could release a 4.5ghz Piledriver, Ivy Bridge can still easily overclock from 3.5ghz to 5.0ghz on air cooling. Since we are enthusiasts and not average consumers, it's only logical to compare top speeds on air cooling. Not many people here spend $200-300 on a CPU and not overclock it. Under those conditions, Sandy Bridge and Ivy Bridge would have higher overclocking and at the same time lower power consumption, only extending their lead.
Essentially, Piledriver will not change a single thing. Next year Intel will add another 15% IPC increase with Haswell and most likely it will overclock even higher than 5.0ghz because 22nm process will have matured even more in 12 months.
It's perfectly OK to buy AMD chips because 1 person might prefer AMD over Intel. However, let's be subjective here and look at the reality based on facts. Right now, AMD's CPU performance is so far behind that even a 1st generation overclocked Nehalem/Lynnfield processor such as i7 920 @ 4.0ghz or i7 860 @ 3.9ghz would beat Bulldozer in 90% of applications. Bulldozer would net some wins in Rendering, Video Encoding, Encyption. If you perform those tasks often, there is a case for Bulldozer. Problem is i7 920 is a chip from 2008. So Bulldozer competes against SB and Piledriver will compete against IVB and most likely to some extent Haswell.
Basically, if someone wants to support AMD, there is a legitimate way to do so by buying their superior HD7900 series. But calling Intel CPU users fanboys is actually the most ridiculous thing anyone can say since it's actually difficult if not impossible to make a case for AMD's CPUs > $100 at the moment based on benchmarks, overclocking and/or power consumption.
But if people still want to argue facts, there are plenty of professional reviews that contradict their assessment that AMD has "competitive CPUs".
Gaming performance with HD7970:
For example, the Pentium G630 and Pentium G860 performed just slightly below and above AMD's venerable Phenom II X4 955, respectively. Even more eye-opening was that the new FX-4100, -6100, and -8120 actually underperformed both budget-oriented Intel chips, despite their higher price points. The Athlon II X3 and X4 CPUs were left in the dust, along with the Llano-based A8 and A6 APUs, and the A4-3400 performed dismally.
Pushed as far as they can go on air, no AMD CPU can touch a stock Core i5-2400 in the same benchmark suite.
http://www.tomshardware.c...eview-overclock,3106.html
It would be laughable for someone with HD7970 or a pair of those to use an AMD based CPU. Who would cripple $600-1200 worth of graphics performance? Even AMD tells reviewers to test their HD7970 graphics card with Intel CPUs to not show CPU bottlenecks!