- Joined
- Apr 29, 2002
This looks like it would be fun to play with.
Intel to release 22-core Xeon E5 v4 “Broadwell-EP” late in 2015
Intel to release 22-core Xeon E5 v4 “Broadwell-EP” late in 2015
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Yes! More cores in the enterprise market means it will eventually trickle down to enthusiast products I hope Bclk overclocking makes a comeback with these chips.
If I'm right then these chips, the same as Haswell based Xeons will have only 100 bclk option so all ~5-7MHz bclk OC. If it was possible then I would buy 8 core Xeon right now as price of the lowest version is about the same as 5930K.
The main problem with dual socket vs single for gaming/overclocking is that Xeons have lower base clock than i7 so when you get 2x2.4GHz 8 core Xeon then you will have about as high performance as on single 5960X overclocked to 4.8GHz. Even though 5960X cost a lot then overall cost for the platform will be much lower using single socket.
There are also other limitations like lower max bclk, lower max memory clock etc. Also I doubt we will see any platforms for Xeons that support overclocking like it was couple of years ago.
@Pierre , I'm not sure why it's not working at higher memory clock. All servers which I was installing were working at 2133. At least I was ordering only servers with 2133 memory as price was the same as for 1866.
A NUMA system for gaming is an interesting idea, but I'd imagine the OS would allocate all the game's processes/threads on one socket, I can't imagine it would be good for a real-time app. like a game to be using non-local memory because of the additional latency and non-cacheable nature of non-local memory access. Has anyone ever tried gaming on a NUMA system?
Non-local memory can be cached. However, whenever one NUMA region writes to a cacheline, it needs to follow an invalidation protocol to inform other regions that if they have that line cached, it should be invalidated.
I know a guy over at 2cpu.com who games on a dual socket Intel workstation with 36/72 cores/threads and has optimized everything for gaming. He also has 2x TitanX GPU cards. I think he benches too, but mostly for his own hardware validation purposes.
OK, so I cache a copy of non-local memory in my local cache. How is the other CPU going to know I've cached it? It better not be a write-back cache either, otherwise we have the overhead of implementing the MESI protocol over a QPI link and maybe even across multiple levels of cache on a remote CPU.