What is the fastest commercially available CPU without speculative execution?
Fastest CPU with no speculative execution
Nolan Diaz
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Benjamin Hernandez
Not OP, but I too am interested in this. I see all these hardware vulnerabilities piling up
and I feel like it's only a matter of time before SHTF on a major scale. I don't mean armageddon, but something so wide reaching it may alter computing for years or decades
P.S: I wish AMD and Intel fanboys would put aside their obsessions and focus on the real danger
Easton Ramirez
It's a legit useful feature that've been around since the 90s, I don't think they even sell cpus without that anymore
Bentley Howard
The C3 vulnerability is fun, but it's in an outdated processor (Via's new ones aren't affected) and doesn't depend on predictive branching or anything x86-specific.
Austin Parker
Atom had no speculative execution until relatively recently.
Christopher Torres
the current batch of vulnerabilities are neither easy to exploit nor are there known circulating remote exploits (well the 15 bits an hour one I think).
I'm more concerned about what the future holds. We haven't seen the last of this. Now that security researchers know where to dig, they'll dig deeper.
Adam Cook
forum.level1techs.com
github.com
>According to a kernel patch that just landed (not yet merged in any release), the CPUs that don't do speculative execution and hence are not vulnerable to any of the 3 variants are:
> + { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_CEDARVIEW, X86_FEATURE_ANY },
> + { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_CLOVERVIEW, X86_FEATURE_ANY },
> + { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_LINCROFT, X86_FEATURE_ANY },
> + { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_PENWELL, X86_FEATURE_ANY },
> + { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_PINEVIEW, X86_FEATURE_ANY },
> + { X86_VENDOR_CENTAUR, 5 },
> + { X86_VENDOR_INTEL, 5 },
> + { X86_VENDOR_NSC, 5 },
> + { X86_VENDOR_ANY, 4 },
Bonnell-arch Atoms have no specex. The fastest one available as a desktop board appears to be the D2700. It's comparable to a 1.5 GHz Pentium 4 in single-threaded benchmarks.
cpubenchmark.net
Thomas Parker
secure64.com
not sure how fast Itanium is compared to today's processors
itanium looks viable because it can run x86 in emulation mode (albeit slowly)
Jack Harris
>atom
AHAHAHHAHAHAHAHAHAAHAHHAHH
Wyatt Jackson
>RISC V
Jordan Lee
X86 emulation mode? You run your OS and programs natively.
The x86 software can remain on the insecure x86 machine.
Elijah Taylor
Can you buy affordable Itanium mobos and CPUs somewhere? MicroATX would be perfect.
Blake Martinez
Actual RISC-V CPUs are going to have specex sooner or later.
William Ramirez
I would give all the other archs a shot if they actually bothered to put out some cheap dev boards.
We already have a bazillion ARM dev boards, where's ppc64 and RISCV and so on??
Caleb Harris
>PowerPC
Try a hacked Wii U.
Brayden Cruz
Would it even be up to par with a top-of-the-line G4?
Liam Stewart
It would still be much faster to have a cpu with speculative execution adn tons of patches than to not have it at all
Kevin Williams
That's the kind of performance you might get for x86 without speculative execution.
Henry Fisher
Yes, it's better by an order of magnitude.
Connor Smith
s/for x86 //
Alexander Bailey
>by an order of magnitude
Why do you think that? It's a 32-bit 1.25 GHz, 4 IPC tri-core CPU based with a PowerPC 750-based architecture. I doubt it is 10x faster than a 1.6 GHz, 20+ IPC PowerPC G4 even in tasks that use all three of its cores, to say nothing of its single-thread performance. Also, Wikipedia claims it has speculative execution.
Jack Richardson
bumping for this question
Asher Moore
C64
Julian Thomas
6502 just isn't very nice to work with. 68000 is.