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Old 22-11-2009, 19:12   #11
divine
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Originally Posted by Garp View Post
LGA-1156 is what Intel is aiming at mainstream market. Cheaper chips, cheaper chipsets, a few less features such as lack of triple channel ram and no hyperthreading.

LGA-1366 is what Intel is aiming at the high performance market, and will see new CPU families first, before they make there way to LGA-1156.
Hyperthreading is i7/i5 dependant, not socket. There are hyperthreading and non hyperthreading CPUs on 1156, currently 1366 all have hyperthreading.
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Old 23-11-2009, 05:53   #12
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Intel in confusing nomenclature non-shocker

I was looking for information on the i7 920 and one of the Google links took me to an article about the Pentium D 920 (I think I still have one of those ).
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Old 23-11-2009, 13:16   #13
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I would personally go the 1366 route. The bandwidth is wasted on gaming but it'll come into it's own for video compression and other simular CPU high intensive tasks. The new breed of CPUs such as the gulftown and will work fine with an x58 chipset for some future upgrading.

The new Samsung 1TB F3's look pretty decent too. I might invest in some RAID'ing with these myself.
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Old 23-11-2009, 17:43   #14
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For me at the moment the 1366 is just silly extra money that I can't really afford, particularly the motherboard, and for very little benefit.

We're talking at least another year until we see 8 cores in CPUs and Intel confirm that you need that at least 6 before triple channel really begins to show any benefit. About the main time I imagine I'll push all 4 cores to their max is some of the stuff I do under Linux, other than that games are still not particularly wonderfully multi-threaded, which is where the Turbo feature of the chip comes into advantage, automatically speeding up cores on the chip if others aren't being utilised.

Video compression is increasingly offset to the GPU through CUDA/OpenCL (and decompression through VDPAU and similar.) With the DMI and PCIe links integral in the chips rather than Northbridge on the LGA1156 that's a boost in it's favour, plus video creation benchmarks for the i5-750 seem to leave it fairly even with the i7-920.

As far as I could see the pros of cheap and comparable performance to the i7-920 (whilst consuming less power) with only a few negatives against it for situations I'm not likely to be in for a fair while (P55 CrossFire/SLIs nicely but marginally slower than X58 based systems due to the on die PCIe controller sharing 16x bandwidth)

Benchmarks like these seem to suggest the only times the i5-950 starts to lose out to the i7-920 is where HyperThreading shows advantages (which isn't all that often), and will knock the i7-920 into a top hat when it comes to single threaded apps:
http://anandtech.com/cpuchipsets/showdoc.aspx?i=3634
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Old 23-11-2009, 19:17   #15
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Very interesting debate here. I keep considering an upgrade and really don't know enough to decide whether to go i7 or i5 (was planning i7, but that was before i5 existed).

In the past, I discovered HT was a waste of time for multi-core/multi-CPU environments. Perhaps my choice of running SETI wasn't a good real-world example, but I found it saturated the memory bandwidth before HT got a look in.

This might not happen now with newer cores/bigger caches/faster memory. I just don't know.
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Old 23-11-2009, 19:43   #16
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Very interesting debate here. I keep considering an upgrade and really don't know enough to decide whether to go i7 or i5 (was planning i7, but that was before i5 existed).

In the past, I discovered HT was a waste of time for multi-core/multi-CPU environments. Perhaps my choice of running SETI wasn't a good real-world example, but I found it saturated the memory bandwidth before HT got a look in.

This might not happen now with newer cores/bigger caches/faster memory. I just don't know.
At one stage HyperThreading presented an additional disadvantage that meant it was best left disabled for most servers. I've no idea whether they've got around to fixing this or not:

Both threads operate on the same core and so use the same on-die cache. Regularly if a thread discovered the data it needed wasn't cached it would flush the cache and fetch it. In a fair number of cases the HT 'virtual CPU' would be handling something different from the primary CPU, resulting in a large waste of time purging CPU cache and refilling it. Depending on the task and the general work of a system HT could actually cause it to be slower!
I discovered that to be true even on dedicated MySQL boxes, which I assumed would be fine given the similarity of the task. For the most part the threads on the CPU would be doing totally different tasks with the data, and we'd see a boost from disabling HT.
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Old 23-11-2009, 19:46   #17
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I saw some benchmarks that showed HT causing performance drops. I can only imagine they did something stupid to manage that but i'm not personally convinced HT is all that useful. There isn't much an i5-750 won't monster through and the stuff it can't, I suspect more raw speed would be of more benefit than HT.

I honestly think 1366 i7 is now the domain of really hardcore users - people who want/need the fastest CPU they can get, or need a capability of X58 like tri SLI etc. 'Normal' people just don't need it.
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Old 23-11-2009, 19:55   #18
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I saw some benchmarks that showed HT causing performance drops. I can only imagine they did something stupid to manage that but i'm not personally convinced HT is all that useful. There isn't much an i5-750 won't monster through and the stuff it can't, I suspect more raw speed would be of more benefit than HT.
I hope to heck they've actually fixed the cache purging thing. That's been around since the earliest days of HT, and the particular study that got me investigating is probably around 4 - 5 years old now. That should be ample time in which to fix it.

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I honestly think 1366 i7 is now the domain of really hardcore users - people who want/need the fastest CPU they can get, or need a capability of X58 like tri SLI etc. 'Normal' people just don't need it.
That was pretty much my view in the end. That and no doubt we'll be saying good bye to both within a year or two anyway. It seems to me that every time Intel (and AMD for that matter) release a new socket interface they proclaim that it'll last a long time and it rarely does.
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Old 29-11-2009, 18:57   #19
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Engadget managed to get hold of a roadmap.

Once again Intel aiming with the confusing naming scheme at their high volume sales point. It reads almost like they're deliberately out to fox people, e.g an i5 651 will actually be worse than a i5 650, and will be $90 cheaper. Surely that's an arse about tit way to do it? You'd think a higher number full stop would be better.
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Old 29-11-2009, 19:11   #20
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You'd think a higher number full stop would be better.
Hasn't worked since the MHz days. I'm not familiar with the AMD roadmap, but I suspect it doesn't work there. Also doesn't work with GPUs from either main vendor.
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