Intel Confirms L4 Cache in Upcoming Meteor Lake CPUs

Published 2023-04-25 09:09 by Hilbert Hagedoorn

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BLEH!

2023-04-26 14:45

Horus-Anhur:

The L4 cache on the 5775C with ~30ns of latency and 50Gb/s of bandwidth was good, but not amazing. It pretty much had double the bandwidth and half the latency of system memory. It did have 128MB of it, so hit rates were good. But put that cache on one of today's Intel's CPU and it would make go slower. Of course, almost a decade later, Intel will be able to make an L4 cache that is much faster.

Those are still pretty competitive in gaming these days, even if hamstrung by a low clock ceiling with that early 14 nm process...

#6125923

Horus-Anhur

2023-04-26 15:03

BLEH!:

Those are still pretty competitive in gaming these days, even if hamstrung by a low clock ceiling with that early 14 nm process...

Latency wise, it's still better than RAM. But bandwidth is half of what we can get today with DDR5 on a 13th Gen CPU. Also consider that the L3 latency on a 7800X3D is around 11ns and a bandwidth of over 700GB/s.

#6125924

bobnewels

2023-04-26 15:05

Well at least Intel cushioned the blow somewhat from buying a new CPU cooler if you already have a LGA 1700 but it is Intel so that CPU cooler cost is it going to be added to the CPU cost.

#6125932

AuerX

2023-04-26 15:34

This could be my 5800X3D replacement, eventually.

#6125940

tunejunky

2023-04-26 15:53

i haven't been this stoked for a new Intel proc since Haswell-E

#6126206

Astyanax

2023-04-27 06:36

Undying:

This will be good. I remember 5775c being fast as 6700k just for the L4 cache it had.

L4 in that processor should have only used by the igp.

#6126220

cucaulay malkin

2023-04-27 07:55

Horus-Anhur:

The L4 cache on the 5775C with ~30ns of latency and 50Gb/s of bandwidth was good, but not amazing. It pretty much had double the bandwidth and half the latency of system memory. It did have 128MB of it, so hit rates were good. But put that cache on one of today's Intel's CPU and it would make go slower. Of course, almost a decade later, Intel will be able to make an L4 cache that is much faster.

it was same perf uplit as v-cache on 5000/7000. https://forums.guru3d.com/threads/intel-arc-a770-now-outperforms-rtx-3060-according-to-new-intel-slides.447508/page-2#post-6125641

#6126250

Horus-Anhur

2023-04-27 10:15

cucaulay malkin:

it was same perf uplit as v-cache on 5000/7000. https://forums.guru3d.com/threads/intel-arc-a770-now-outperforms-rtx-3060-according-to-new-intel-slides.447508/page-2#post-6125641

That L4 cache had an advantage over the 3DV cache. Size. On Zen, it ads 64MB. But that L4 ads 128. So hit rates should be significantly higher.

#6126287

cucaulay malkin

2023-04-27 12:42

ml can have up to 512mb

#6126371

tunejunky

2023-04-27 15:22

cucaulay malkin:

ml can have up to 512mb

unless Intel pulls a meathead move and puts software locks (with different paid access) on the entire cache. which i would hate just as much as the same type of thing on Xeon

#6126493

cucaulay malkin

2023-04-27 20:02

imo it'll end up somewhere around 192mb-256mb for the i7, a little more for the i9 and a little less for the i5.