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Steamroller (microarchitecture)

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Steamroller
General information
LaunchedH2[expand acronym] 2013
Common manufacturer
Architecture and classification
Technology node28 nm
Instruction setAMD64
Physical specifications
Socket
Products, models, variants
Core name
History
PredecessorPiledriver
SuccessorExcavator

Steamroller is a microarchitecture under development by AMD to succeed Piledriver in the second half of 2013.[2]

In 2011, AMD mentioned (by name) a third-generation Bulldozer-based line for 2013,[3] with working title Next Generation Bulldozer, on the 28 nm manufacturing process.[4] On 21 September 2011, leaked AMD slides indicated this third generation of Bulldozer core was codenamed Steamroller.[5][6]

Steamroller will still feature two core based modules found in Bulldozer and Piledriver designs.[2] The focus of Steamroller is for greater parallelism.[7] Improvements will center on independent instruction decoders for each core within a module, better instruction schedulers, improved perceptron branch predictor, larger and smarter caches, up to 30% less instruction cache misses, dynamically resizable L2 cache, Micro-Op queue,[8] more internal register resources and improved memory controller.

AMD estimates that these improvements will increase instructions per cycle (IPC) up to 30% while maintaining Piledriver high clock rates with decreased power consumption.[2]

Processors

  • Kaveri A-series APU — Desktop Budget and Mainstream market (Unknown platform): The Trinity/Richland APU line is scheduled to be replaced by the Kaveri APU line as the third generation A10, A8, A6, and A4 series for the desktop market in February 2014.[9]
The new APUs will feature 2-4 Steamroller cores and an GCN 2.0 Volcanic Islands GPU.[10] Reports have also claimed it will feature both a DDR3 and GDDR5 integrated memory controller, although it appears that both memory types cannot be used together.[11]
Kaveri APUs will utilize a new FM2+ form-factor and will not be backwards compatible with previous generation FM2 motherboards.[12]
  • Kaveri A-series APU — Notebook Mainstream and Performance market (Indus platform): Will be the same as mentioned in Desktop Budget/Mainstream market. The FCH chipset will be codenamed Bolton.
  • Berlin APU — Enterprise and Server: Berlin will be similar to Kaveri featuring four Steamroller cores and up to 512 stream processors and ECC memory support.[13]

AMD has neither confirmed nor denied that the FX-series will receive a Socket AM3+ or new socket version of a Steamroller based CPU.[4][14][15]

According to an unconfirmed report, internal AMD documents suggest a Steamroller FX-series of CPUs will not be released.[16] Another article, citing anonymous sources with knowledge of AMD's internal roadmap extending into the 2015, also lacked any reference to a new FX-series processors.[17]

AMD's server roadmaps show only a four-core Steamroller Berlin APU and up to 16-core Piledriver-based Warsaw CPU in 2014.[18]

References

  1. ^ "AMD Vows Not to Drop Microprocessor Sockets in Next Two Years". X-bit labs. 2012-12-05. Retrieved 2013-09-29.
  2. ^ a b c "AMD: We Are On Track With Steamroller Micro-Architecture in 2013". X-bit labs. 2013-03-31. Retrieved 2013-09-29.
  3. ^ Anton Shilov (2010-11-09). "AMD Plans to Release Twenty-Core Microprocessor in 2012". X-bit labs. Retrieved 2012-01-23.
  4. ^ a b "2012 Financial Analyst Day". 2012-02-02. Retrieved 2013-09-29.
  5. ^ "Hosszútávú mobil útiterv szivárgott ki az AMD-től - PROHARDVER! Processzor hír". Prohardver.hu. 2011-09-21. Retrieved 2012-01-23.
  6. ^ "Nuove roadmap AMD sulle future APU in programma nel 2012 e nel 2013 per il mercato mobile". 2011-09-21. Retrieved 2012-01-23.
  7. ^ Su, Lisa (2012-02-02). "Consumerization, Cloud, Convergence" (PDF). AMD 2012 Financial Analyst Day. Sunnyvale, California: Advanced Micro Devices. p. 26. Retrieved 2012-02-04.
  8. ^ http://www.anandtech.com/show/6201/amd-details-its-3rd-gen-steamroller-architecture/2
  9. ^ Reynolds, Sam (2013-07-27). "New confirmed details on AMD's 2014 APU lineup, Kaveri delayed". Retrieved 2013-09-29.
  10. ^ "AMD Unveils Innovative New APUs and SoCs that Give Consumers a More Exciting and Immersive Experience". Retrieved 2013-09-29.
  11. ^ "AMD Kaveri Unveiled: PC Architecture Gets GDDR5". 2013-03-05. Retrieved 2013-09-29.
  12. ^ "AMD's Next-Gen "Kaveri" APUs Will Require New Mainboards". X-bit labs. 2013-05-30. Retrieved 2013-09-29.
  13. ^ "AMD Berlin Server APU Provides Glimpse At Upcoming Kaveri APU With 4 Steamroller Cores and 512 GCN SPs". 2013-06-19. Retrieved 2013-09-29.
  14. ^ Josh Walrath (2013-09-04). "AMD's Processor Shift: The Future Really is Fusion". Retrieved 2013-09-29.
  15. ^ "AMD's Steamroller Detailed: 3rd Generation Bulldozer Core". Anandtech. 28 August 2012. Retrieved 28 July 2013.
  16. ^ Reynolds, Sam (2013-08-05). "Updated: Why it's a big deal AMD is delaying Kaveri". Retrieved 2013-09-29.
  17. ^ "AMD updates product roadmap for 2014 and 2015". 2013-08-26. Retrieved 2013-09-29.
  18. ^ "Berlin, Warsaw are the future of AMD's x86 server lineup". The Tech Report. 2013-06-18. Retrieved 2013-09-29.
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