The Clarkdale Review: Intel's Core i5 661, i3 540 & i3 530by Anand Lal Shimpi on January 4, 2010 12:00 AM EST
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I swear this is the longest it’s taken for an Intel architecture to penetrate the market. We first met Nehalem on November 3rd, 2008. It came to us as a high end quad-core processor and took a full year to make it to more affordable motherboards in the form of Lynnfield. Even with P55 motherboard prices down at the magical $99 marker, Intel relinquished control of the $100 - $200 CPU market without a Nehalem to compete down there. Instead we were left with a choice between Penryn, the update to Intel’s 2006 Conroe architecture, or Phenom II, AMD’s low-cost Nehalem competitor. The choice was simple.
From $100 to $200, your best bet has been AMD. Either through aggressive pricing on quad-core CPUs or the L3-cache-less Athlon II line, AMD controls the $100 - $200 market. Today we meet Intel's first 32nm CPUs, codename Clarkdale, designed to specifically target that $100 - $200 market.
Two cores, Nehale..err Westmere-style
Technically Clarkdale isn’t Nehalem, it’s Westmere. Take Nehalem, use 32nm transistors, add in some new instructions for accelerating encryption/decryption, and you’ve got the makings of Westmere.
Clarkdale uses a dual-core Westmere and sticks it next to a 45nm Intel GMA die. That’s right, meet the first (er, second) Intel CPU with on-chip graphics. Next year we’ll see Sandy Bridge bring the graphics on-die, but until then we have Intel’s tried and true multi-chip-package to tide us over.
We don’t get on-die graphics yet because Intel still hasn’t switched over to its make-everything-at-the-best-process-ever strategy. The 32nm fabs are ramping up with CPU production and the 45nm fabs need something to do. Nearly every desktop and laptop sold in 2010 will need one of these 45nm GMA die, so the fabs indeed have something to do.
It’s not all rosy with Clarkdale unfortunately. Remember the memory controller that Nehalem so graciously integrated? Clarkdale kicks it off die again. The IMC is housed in the 45nm GMA die. It’s still on-package, but not on-die. The benefit is super fast memory access for the graphics core, but slower memory access for the CPU core. In fact, this is a derivative of the memory controller used in older Intel chipsets (e.g. P45/X48).
The CPU connects to the GMA die using QPI, so bandwidth shouldn’t be as big of a problem. Latency is unfortunately hurt as a result. Access times can be longer than older LGA-775 processors thanks to this memory controller design being optimized for FSB architectures. Again, the problem goes away with Sandy Bridge, but today we’re faced with it.
Like Lynnfield, Clarkdale uses Intel’s LGA-1156 socket. Clarkdale should work in all P55 motherboards, but you’ll need a BIOS update. No existing P55 motherboards route video from the socket to a VGA/DVI/HDMI connector, so you’ll need a new motherboard if you want to take advantage of the on-package graphics. Enter the H55, H57 and Q57 chipsets.
A typical H57 I/O layout
The H and Q-series of chipsets feature what Intel calls its Flexible Display Interface (FDI). This is basically a link between the CPU and the chipset that passes along video output. H5x/Q57 motherboards will have a video out on board so you can use Clarkdale’s integrated graphics.
The chipsets differ in price and features. The table below sums it up:
Support for Intel’s Rapid Storage Technology is probably the main reason you’ll want H57 over H55. The difference between H57 and Q57 boils down to security and management features. The H-series is for consumers, the Q-series is for corporate customers. Make sense?
The chips themselves are pretty straightforward. Intel is launching seven desktop Clarkdale processors (and a whole lot more notebook Arrandale chips):
|Processor||Core Clock||Cores / Threads||L3 Cache||Max Turbo||TDP||Price|
|Intel Core i5-670||3.46GHz||2 / 4||4MB||3.76GHz||73W||$284|
|Intel Core i5-661||3.33GHz||2 / 4||4MB||3.60GHz||87W||$196|
|Intel Core i5-660||3.33GHz||2 / 4||4MB||3.60GHz||73W||$196|
|Intel Core i5-650||3.20GHz||2 / 4||4MB||3.46GHz||73W||$176|
|Intel Core i3-540||3.06GHz||2 / 4||4MB||N/A||73W||$133|
|Intel Core i3-530||2.93GHz||2 / 4||4MB||N/A||73W||$113|
|Intel Pentium G9650||2.80GHz||2 / 2||3MB||N/A||73W||$87|
The six processors labeled Core i5s and Core i3s all have the same basic architecture. You get per-core 256KB private L2s and you get a 4MB L3 cache shared among both cores (down from 8MB from the quad-core Lynnfield/Bloomfield chips). The i5s get turbo mode while the i3s do not. The i5-661 uses a higher graphics clock and has a higher TDP than the 660. Remember that these are CPU+GPU combos on a single package, so GPU clocks do vary based on model.
The Clarkdale lineup is honestly made up of CPUs that are too expensive. The Core i5 670, 661/660 and 650 are all priced above $170 and aren’t worth the money. The problem is Lynnfield’s turbo mode gives you high enough clock speeds with two threads that there’s no need to consider a dual-core processor. You can buy a Core i5 750, have more cores than any of these Clarkdales and run at close enough to the same frequencies for $196. Or you can buy a Phenom II X4 965 for about the same price and have much better multi-threaded performance. The chips that are most interesting are the Core i3s.
|Processor||Clock Speed||Max Turbo|
|2 Cores Active||1 Core Active|
|Intel Core i5-670||3.46GHz||3.60GHz +3.9%||3.73GHz +7.7%|
|Intel Core i5-661||3.33GHz||3.46GHz +4.0%||3.60GHz +8.0%|
|Intel Core i5-660||3.33GHz||3.46GHz +4.0%||3.60GHz +8.0%|
|Intel Core i5-650||3.20GHz||3.33GHz +4.2%||3.46GHz +8.3%|
|Intel Core i3-540||3.06GHz||N/A|
|Intel Core i3-530||2.93GHz||N/A|
Turbo just isn't as interesting with only two cores. With four cores you used to have to make a tradeoff between good 4 and 2 threaded performance, but Lynnfield fixed that. No one really debates single vs. dual core anymore. The single core turbo modes are great, but aren't worth the money. Pay attention to the i3s.
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marc1000 - Monday, January 4, 2010 - linkIndeed, I want an Atom+ION, but it has not yet come to public availability in Brazil. And Intel is killing ION with the new Atoms, so I believe I won't ever see a Atom+ION board here, because the stores will only launch only the "newer" Atom boards (that is, IF they even launch it...)
efficientD - Saturday, January 9, 2010 - linkThe other problem with and atom setup is the low cost no L3 cache Athalons. With a decent 785G mainboard, you can get much better performance in only a slightly bigger package for about the same HTPC money. That is the direction I would go if I could build an HTPC right now.
IntelUser2000 - Monday, January 4, 2010 - linkThe reason for high idle and in some way, high load power is due to the Asus board. Not only that, but the H57 chipset.
The Intel H55 mobo will lower power consumption enough to get it below the i5 750 and i7 860.
Kaleid - Monday, January 4, 2010 - linkWould these be chips on would dare to overclock considering the foxconn socket problems that has been reported here @ anandtech?
Zool - Monday, January 4, 2010 - linkIts quite confusing now, with 9 desktop and 11 mobile i-xxx cores now. Not a single digit shows core numbers or the gpu on the new 32nm cpus.
Actualy its a total mess now for a average user.
marc1000 - Monday, January 4, 2010 - linkI second your opinion!!! Perhaps Intel hired some marketing folks from Nvidia!!! =D
Harry Lloyd - Monday, January 4, 2010 - linkSo which chip is responsible for HDMI Audio - the CPU, or the H5x chipset?
Can we get HDMI audio support with a Lynnfield CPU?
And one other thing - I assume we can use HDMI audio without haeving to use the integrated GPU (for display) when we have a PCI-E card?
DigitalFreak - Monday, January 4, 2010 - linkThe GPU on the processor.
Alberto - Monday, January 4, 2010 - linkThe main problem is the Motherboard, likely an early sample not much optimized. Both Xbit Lab and The Tech Report have found a lower idle system power consumption in the new Intel plataform versus the Lynnfield solution. Maybe This article needs of a fast update :-)
Alberto - Monday, January 4, 2010 - linkThe italian site www.hwupgrade.it have discovered even better results. Over an Intel DH55TC motherboard this new cpu is IMPRESSIVE at idle.
Intel seems right again.