Core i5 650 - 660 and 661 processor review - Hyper Threading | H55 PCH | Nehalem overview

Posted by Hilbert Hagedoorn on: 01/02/2010 02:00 PM [ 0 comment(s) ]

Hyper Threading

Inevitably, all chips based on the Nehalem family will have between two and eight cores, and will be capable of handling two independent software threads per core. This is called Hyper-Threading, Intel's name for the concept. It allows a processor to execute two different code streams at pretty much the same time.

This was a feature found in Intel's single-core Pentium 4 processors but largely discontinued with the advent of multi-core chips, but it's essentially the same technology as before. With two threads per core, Core i3, i5 and i7 chips will pack no less than four or eight logical cores depending on the model.

If you look at the screenshot below you can see that happening. Mind you that the Core i3 540, 530 and then Core i5 650, 660 and 661 have Hyper-Threading, the Core i5 750 series weirdly enough does not (unfortunately) have Hyper-Threading. All Core i7 processors are hyper-threaded as well.

Here we see Core i5 661 - It has two physical cores, but hyper-threaded we gain two virtual logical cores.

Placing the Nehalem processor family in perspective

Intel has got a lot in store with the Nehalem family processors right now. We placed all data that we know of into a chart, also this is a handy chart to see which processor has which socket/package and what more you can expect anno Q1 2010 desktop processor wise (we left out the mobile parts as that makes things even more confusing).

	Model	LGA socket	Core/Thread	Clock	Turbo boost	L3 cache	TDP	Price
45nm Bloomfield	Core i7 975	1366	4/8	3.33	3.60	8	130	999
	Core i7 950	1366	4/8	3.06	3.46	8	130	562
	Core i7 920	1366	4/8	2.66	2.93	8	130	284
45nm Lynnfield	Core i7 870	1156	4/8	2.93	3.60	8	95	562
	Core i7 860	1156	4/8	2.80	3.46	8	95	284
	Core i7 870s	1156	4/8	2.80	3.46	8	82	337
	Core i5 750	1156	4/4	2.66	3.20	8	95	196
	Core i5 750s	1156	4/4	2.66	3.20	8	82	259
32nm Clarkdale	Core i5 670	1156	2/4	3.46	3.73	4	73	284
	Core i5 661	1156	2/4	3.33	3.60	4	87	196
	Core i5 660	1156	2/4	3.33	3.60	4	73	196
	Core i5 650	1156	2/4	3.20	3.40	4	73	176
	Core i5 540	1156	2/4	3.06	none	4	73	143
	Core i5 530	1156	2/4	2.93	none	4	73	123
	Pentium G9650	1156	2/2	2.80	none	4	73	87

PCH - The Platform Controller Hub H55 chipset

To facilitate the Clarkdale processors, Intel needed to come out with a new chipset, in fact they'll be released two of them each with their own derivative sidekicks. This is needed to run the integrated graphics via what's labeled as the Flexible Display Interface (FDI). Intel is offering two new chipsets to the market, H55 and H57/Q57. P55 actually should also work fine, yet obviously not with the embedded IGP. We will actually put this to the test today.

Intel Core i5 661 (Clarkdale)

Now you might think the platform will be cheap and well, honestly it's average at best. Intel will charge its partners 40 to 44 USD per chip per 1K units. In pale comparison, Intel charges 40 USD for a P55 chip to the motherboard manufacturers.

So enough tech chatter, let's put the gear to the test. We received an H55 motherboard and Core i5 661 dual core processor for a test run. Let's check out what this 196 USD processor will bring to the table. But first, let's have a look a some photos of the processor and motherboard itself.

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