It will take fewer cycles to load operations on the processing units. The company also made the chip's integer and floating point processing units more dynamic and accessible to single- and multithreaded workloads. However, a slide about Zen showed at the Hot Chips conference this week showed the 元 cache size as 8MB. Clark didn't disclose the size of the 元 cache but said it will be much faster than in previous chips.
It shortened the size of the L2 cache to 512KB and widened the size of the 元 cache. They designed in a fatter pipeline that can get more instructions to the machine, allowing for the faster execution of commands.ĪMD also changed the cache structure in Zen. They also introduced a new chip structure for Zen with a restructured memory subsystem that was faster and shorter in length. The new architecture runs two threads per CPU core, which could boost performance while remaining power efficient. and instructions per clock."ĭesigners looked at architectural weaknesses in the previous chips, etched out a Zen chip design on paper, then got to work. "We had good design metrics so we knew we didn't lose power. "It's a very dynamic iterative process through the design phase," Clark said. The chips will have eight to 32 cores, and the 32-core chips could come in quad-CPU configurations, but those details aren't finalized yet, Clark said.įrom day one, AMD's designers knew they had to keep the aggressive power-efficiency goals in mind, a consideration the company usually introduced a lot later in the chip design process, Clark said.ĭesigners needed to "treat power as an equal citizen" to the 40 percent performance improvement goal, Clark said. The Zen server chips will first reach high-end gaming workstations early next year, followed by servers and then laptops. Both moves gave AMD a competitive advantage over Intel at the time. Zen could be as significant as AMD's introduction of 64-bit server chips in 2003 and dual-core chips in 2004. With Zen, AMD is looking to relive its glory days in chip design. The Bulldozer chips, which started shipping in 2011, affected followup chips considered derivatives. AMD's CPU performance has fallen behind rival Intel's, and the Bulldozer architecture, even in the company's eyes, was an unmitigated failure.
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Intel ran away with the PC and server markets after AMD encountered design and manufacturing problems with some recent chips. If benchmarks of PCs with Zen hold, a 40 percent boost in CPU performance will be a radical improvement compared to low-double digit improvements claimed by Intel and AMD in recent x86 chips. The company recently demonstrated chips to prove it has achieved the goal.
"It was a very aggressive goal, and we knew we had to do it to be competitive."ĪMD first promoted the 40 percent CPU improvement goal when it introduced Zen in 2015 during an overhaul of its chip roadmap. "We had a hard time convincing the team we were going for 40 percent," said Mike Clark, a senior fellow at AMD.
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