Originally posted by jacob
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SiFive's RISC-V HiFive Unmatched Upgraded To Ship With 16GB Of RAM
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Last edited by microcode; 08 December 2020, 10:11 PM.
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Originally posted by uid313 View Post4 cores is very little. All the modern ARM boards have 8 cores.
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Originally posted by microcode View Post
Literally nothing you said here is true. OoO is not the culprit in the timing attacks you are thinking about, speculative execution and loads are. There are also application processors that are in-order, and yes they often end up in embedded scenarios.
There are also speculative in-order cores, i.e. Cortex-A8 (2005), Mill (WIP), Intel Bonel / Saltwell (2008 / 2011), Itanium Merced and McKinley(2001) , UltraSPARC (1995), POWER6 (2007). (I only list relatively high performant designs).
Rest of high performance CPUs, are OoO and speculative, PowerPC, POWER, Alpha, SPARC64, Intel Pentium, AMD K5, MIPS R1000, HP PA-8000, DEC Alpha, Intel Core, Almost all high performance ARM cores, etc.
The issue is not with speculative execution itself, or OoO, but the implementation. There were serious bugs in silicon and microarchitecture design, that lead to the problems. There are OoO with and without speculation, and in-order speculative designs, that doesn't suffer from Meltdown at all. (The in-order non-speculative ones, well, they can't have issues like that either obviously).
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Originally posted by Alexmitter View Post[ARM processors] also have branch prediction and other fancy stuff. But thats not the point with such a small series silicon by a tiny company.
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Originally posted by PublicNuisance View PostThis works out well for me. I won't be able to order one until March anyway so the delay doesn't hurt me at all and the 8GB of extra RAM is fantastic.
They also aren't open source and blob free. While I would love to have 8 cores over 4 for me being open source/blob free is a bigger priority.
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Originally posted by torsionbar28 View PostThis is a dev board, not a productivity workstation. Besides, it was only in 2017 when *all* of intel's top Core i7 chips were 4-core. There's not much of an ecosystem out there for consumer software that can leverage more than 4 cores right now. Again, plenty adequate for a dev board like this.
If it is to be a dev board, it should probably have a mix of heterogeneous cores, such as 4 weak cores and 4 strong cores, so you can develop to take advantage of heterogeneous environments where not all cores are equal. Seems to be a pretty shitty dev board if you cant use it to develop systems for heterogeneous computing environments.
Originally posted by brad0 View Post
Not true.
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Originally posted by uid313 View PostYeah, but Intel Core i7 beats this at everything and anything. This can't even compete with Intel, maybe it can wish to compete with ARM but the ARM boards have 8 cores. Even the shitty Raspberry Pi has 4 cores so this is not impressive at all.
If it is to be a dev board, it should probably have a mix of heterogeneous cores, such as 4 weak cores and 4 strong cores, so you can develop to take advantage of heterogeneous environments where not all cores are equal. Seems to be a pretty shitty dev board if you cant use it to develop systems for heterogeneous computing environments.
Yes, 4 cores is very little. Pretty much all phones have 8 cores, even the cheap ones. All or most of the Snapdragon series of SoC from Qualcomm have 8 cores. The Apple A14 have 6 cores. 4 cores is little, you could buy phones many years ago with 8 cores.
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