AMD R9 295X ‘Hawaii XTX’ Simulated Benchamrks Surface – Only ~5% Improvement Unless HBM is Used

I have a very interesting article today. Normally I wouldn't post simulated benchmarks from any source but the man behind the curtains is so authentic that he is literally, single handedly, responsible for the entire R9 295X/Hawaii XTX leak. You might remember DG Lee from some months ago whence he successfully reverse engineered the existence of the Hawaii XTX Core and therefore the alleged R9 295X. DG Lee goes through multiple variations of the simulation with wildly varying results and even a variation with stacked DRAM where he uses my HBM table.

AMD's R9 295X with the Hawaii XTX Core gets Simulated Benchmarks with Varying Results - 5% Improvement without HBM

Alright lets dive right in. First of all the source page is here. But if his history is any indicator it could be pulled at any second. He uses his home made algorithm that employs the Stream Processor Count, Texture Mapping Unit Count, Raster Operator Count, GPU and RAM Clock Speed and the Bus Width to predict (very accurately) the performance of a Radeon GPU (the R9 295X) in this case. This simulated benchmarks also unveils the probable performance of the complete and fully uncut Hawaii XTX Core. Without any further ado the first benchmark simulates the GPU with the unlocked core 'as is' and clocks of the R9 290X.

Hawaii XTX Simulated 'as is' with R9 290X Clocks

The results appear to be disappointing. What appears as a 10% increase on paper is actually only a 2.5% increase in simulated 'real life' conditions (anyone notice the oxymoronic irony in this statement). The reason for this is because of increasing diminishing results; you need to add more than before to get the same results as before. The R9 290 and R9 295X are approximately the same 'hardware distance' away from the R9 290X but because of diminishing returns the actual performance increase is not nearly the same. Moving on we have DG Lee increasing the clock speed as much as he deems feasible and the following is the result:

Hawaii XTX Core with Higher Clocks

Now we see a performance increase of about 4-5% relative to AMD's last flagship. Once again the results are not that impressive although they are  nearing the acceptable mark (~10%). It is at this point that he leaves behind the established number crunching and enters the more speculative field. The fact of the matter is that we have no idea what else AMD is going to do with the card apart from the fully unlocked Hawaii core. They can put stuff in (as you will see in a minute) that can increase performance by leaps and bounds.

AMD R9 295X / R9 295XT / R9 295XTX Benchmarks with HBM

I think it is now a valid time to remind you guys that the R9 295X nomenclature is not confirmed. It could as easily be the R9 295XT, R9 295 XTX or something else entirely. Now interestingly Mr Lee actually used my HBM table (Wohoo) from Wccftech's own Pascal Architecture Analysis. He used both the 2-Hi and 4-Hi HBM Configurations to calculate a potential Hawaii XTX equipped GPU with High Bandwidth Memory. Lets start with the R9 295X having default clocks and 2-Hi HBM followed by 4-Hi HBM


Alright! now we are talking. The results now show a 21% improvement which is much more impressive than 5% and very acceptable. So what happens if we ramp it up to 4-Hi HBM? Well you get a performance boost of almost 30% relative to the R9 290X, which means that you have now beaten the Dual Chip 7990. Needless to say these are very impressive numbers but they are Dependant on the fact that AMD will utilize HBM. So unless Red pulls one on us, we are looking at a 5% performance increase in ideal scenarios, with 7-8% performance increase with very optimized drivers.

By Syed Muhammad Usman Pirzada. We cater to your constant need to remain up to date on today's technology. Like us, tweet to us or +1 us, to keep up with our round the clock updates, reviews, guides and more.

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