R9 390X Performance Estimated - HBM Production Ramping For Fiji XT

Two days ago nosotros heard that AMD is preparing two new Republic of the fiji islands based graphics card for Computex in June. The R9 390X and R9 395X2. With the 390X slated to become the new single-GPU flagship from the visitor and the 395X2 taking the torch from the R9 295X2 as the new dual-GPU flagship.

R9 390X Concept Rendering by Videocardz.com

Yesterday Tweaktown stated that they've heard rumors which suggest that these new GPUs while very heady could cease up quite exclusive with a express number of units initially. Due to HBM still ramping up in production. We have known for quite a while that AMD would end upward using this new memory standard for its side by side generation graphics bit for quite sometime. The memory standard was co-developed by AMD and SK Hynix and promises to offer 450% the bandwidth of GDDR5 chips in its first generation and 900% the bandwidth of GDDR5 in its second generation.

HBM Production Ramping Up For Fijji XT- Could Exist In Short Supply Initially

HBM is an entirely new memory spec and volition only debut for the first time this year. Notwithstanding, its introduction will exist a huge milestone equally the engineering will be a cornerstone feature in a high volume consumer production, Fiji. So this is a big deal for SK Hynix who manufacture the retentivity fries. If the memory's introduction to the marketplace turns out to exist a graceful 1 it would instill huge conviction in Hynix's power to evangelize. And would encourage other companies to utilise the new retentiveness technology, driving yield upwardly and cost down for anybody.

Even so it's non really surprising that HBM would begin selling in limited quantities. As stated to a higher place it'south really a huge challenge to introduce an entirely new spec with a loftier volume product. But it seems both AMD and Hynix are willing to accept on that challenge. Which should pave the way for even higher volume products featuring the new retention spec to follow suit.

Nvidia announced that it would start using the technology once the second generation is introduced, which volition be next twelvemonth in all likelihood. Hynix recently showcased a sample of the HBM1 memory information technology's shipping right now and a wafer of HBM2 to prove that the technology is progressing smoothly.

Going dorsum to Fiji and the R9 390 series. Some sites accept speculated on how Fiji XT would perform in comparison to the GTX Titan X. Nosotros have to make information technology plain that it'due south extremely difficult to predict how the chip would perform precisely. This because HBM really is a wild carte du jour in the performance equation for Republic of the fiji islands. We tin can't withal quantify how much of a performance improvement having this much memory bandwidth would yield.

However I will effort to depict a bourgeois estimate of what the performance of the GPU will await like based on the leaked specifications of the fleck. I volition leave out whatever possible performance improvements that the new retentiveness sub-arrangement could show and too negate any possible architectural improvements because we can't quantify these 2 items yet. The approximate volition solely exist based on the leaked number of stream processors and clock speed. Then the actual performance figures should finish up college than our estimation if the leaked specifications are fairly authentic, which nosotros believe them to be.

Wccftech	AMD Radeon R9 390X	AMD Radeon R9 395X2	AMD Radeon R9 290X
GPU Code Name	Fiji XT	2x Fiji VR	Hawaii XT
GPU Cores / Shaders	4096	2x4096	2816
Retentivity	4GB/8GB Stacked HBM	8GB/16GB Stacked HBM	4GB GDDR5
Memory Frequency	1.25Ghz	1.25Ghz	5.0Ghz
Memory Interface	4096 Wide IO	2x4096 Wide IO	512bit GDDR5
Total Retentivity Bandwidth	640GB/S	640GB/South per GPU	320GB/S
GPU Clock Speed	1.05Ghz	one.05Ghz	1Ghz
Compute Operation	8.5TFLOP	17TFLOP	five.6TFLOP
Launch Price	$699 ?	$1499 ?	$549

Our estimation is based on the average FPS figures across nineteen different games tested by TPU in their review of the Titan X. At 4K the operation of AMD'southward GCN based GPUs scales in perfect linearity. For example the 2560 GCN unit R9 290 was precisely ii.0x faster than the 1280 GCN unit HD 7870. Even though the 290 is clocked slightly below the 7870, then this would business relationship for the architectural improvements that AMD introduced with the Volcanic Islands architecture verses the Southern Islands compages.
The performance gauge below is based on scaling with the number of stream processors / GCN units of Republic of the fiji islands XT vs Hawaii XT simply again this does not business relationship for any potential architectural improvements or potential HBM retentivity bandwidth benefits.

Republic of the fiji islands'due south performance tin be calculated past :
[spoiler championship="Awesome Math"]#ane Dividing the number of stream processors of Fiji by the number of stream processors of Hawaii, trusting that the performance volition calibration perfectly with each additional SP based on the scaling we observed with the R9 290 vs 7870 data.
#2 Then multiplying the outcome by Republic of the fiji islands'southward clock speed, which is purported to be 1050Mhz vs 1000Mhz for Hawaii. Which makes Fiji's clock speed 1.05 that of Hawaii.
Performance = Core count x clock speed
= (4096 / 2816) x ane.05
= 1.45 10 1.05
= 1.53
So Fiji should be exactly 53% faster than Hawaii. We then use the data of Hawaii's average performance in nineteen games and multiply information technology by one.53. Beneath is the final result laid out neatly in a bar graph for your viewing pleasure.[/spoiler]

Fiji XT Performance Estimate I have to betoken out that two weather accept to be fulfilled for Republic of the fiji islands to friction match this interpretation. #i It must really accept 4096 Stream processors and #2 A 1050Mhz GPU clock speed.

The results are very interesting considering remember the GTX 980 Ti is rumored to feature a crash-land in clock speeds verses the Titan X. Nvidia will also allow AIBs to sell custom cooled and overclocked versions of the card so we're bound to see GTX 980 Ti cards that perform similarly to the Titan 10. Just even without knowing the performance advantage HBM or the updated architecture of Republic of the fiji islands may bring to the tabular array we can tell that it's going to be an interesting friction match-upward betwixt the 390X and the 980 Ti. We'll continue to follow the scene very closely and bring you updates on both new flagships as before long equally we tin can, so stay tuned.