Core i5 750 - Core i7 860 and 870 processor review
Posted by Hilbert Hagedoorn on: 09/07/2009 01:00 PM [ 0 comment(s) ]
Okay then! You made it to page two. Did you equip yourself with some coffee already? This will be a long and lengthy article.
Before we begin -- a new name change
So with this launch you'll be hearing phrases like Core i3, Core i5 Core i7 and even Core i9. Some of you already know this. But several of you guys and gals will go 'huh?' Intel is attempting to simplify its Intel Core range of products, getting rid of confusing Core 2 Duo, Core 2 Quad and similar names in favor of simpler Core i3 and Core i5 designations joining the recently unveiled Core i7 chips.
It's very simple: Core i3 will be reserved for entry-level products, Core i5 for mid-range products and i7 for flagship offerings. And Core i9... well that remains to be discussed and to be announced.
Meet the new processors
Man, did we have to wait a long time for some new 'mainstream' more affordable yet spicy processors to arrive in the Intel processor arena. So hear me out, for this launch there will be three models released, all are quad-core processors and based on the new Lynnfield core (a separate SKU based off Intel's Nehalem family processor architecture) you've been hearing about for so long now, using the 45 nm fabrication process.
Intel is announcing three processors today:
- Core i5 750 [2.66 GHz] 199 USD
- Core i7 860 [2.80 GHz] 285 USD
- Core i7 870 [2.93 GHz] 555 USD
Some key features:
- Four x86 processing cores with support for HyperThreading technology
- Dual-channel DDR3 memory controller specified to run DDR3-1066 and DDR3-1333 modules
- Support for TurboBoost technology.
- 32 KB instruction + 32 KB data L1 cache per core
- 256 KB L2 cache per core
- Large 8 MB L3 cache shared by all 4 cores
Three new processors, all are Nehalem architecture based, all have a new LGA 1156 socket design and all have the same Core i7 caches, the biggest phat one being a L3 cache of 8MB. All three LGA 1156 processors fall under codename Lynnfield, with Nehalem as the family designation. Intel will begin shipping the Core i5 750, Core i7 860 and Core i7 870 starting this week, with quad core clock-speeds of 2.66GHz, 2.8GHz and 2.93GHz. The three chips are to be priced at $199, $285 and $555 respectively.
Later on in early 2010 we'll see two energy saving versions of the Core i5 750s and Core i7 860s, running at 2.4GHz and 2.53GHz, but with 82W TDP rather than 95W.
Once we insert all the data into a chart, we can understand the product differentiation a little better:
What are the differences between Bloomfield based Core i7 processors and Lynnfield based Core i7 processors? Three things really, dual-channel memory support (not triple-channel), a new socket (1156) and multipliers are locked. So yes, from that perspective Lynnfield processors are definitely a small step back. But don't get scared just yet though, they are seriously fast.
Then you notice the new Lynnfield processor designated Core i5. What's the biggest difference in-between Core i7 and Core i5 you might ask? The Core i5 CPUs are physically the same as the Core i7 Lynnfield parts, yet are further limited. The Core i5 700 range will have the same 8MB L3 cache, VT-x virtual machines and LGA 1156 socket support as the Core i7, but lack the Hyper Threading technology that allows the Core i7 processors to effectively double their core-count to eight. The Core i5 750 is limited to dual-channel memory as well.
- Core i5 750 maximum multiplier 20x133 = 2.66 GHz
- Core i7 860 maximum multiplier 21x133 = 2.80 GHz
- Core i7 870 maximum multiplier 22x133 = 2.93 GHz
So the more important differences are threefold, Lynnfield Nehalem processors are not classified as Extreme editions, and thus the multiplier will be locked, the 800 range will have Hyper Threading, the 700 series will not. Dual-channel memory instead of triple-channel memory and thus that new Socket change from LGA 1366 to LGA 1156.
There is an improvement to be found in Lynnfield's Turbo mode though. Let's go check it out.
KITT -- engage Turbo mode
Core i5 and Core i7 processors have something that is called 'Turbo mode'. Depending on CPU load one or more CPU cores will run above its advertised specification...
Much like the initial Turbo mode introduced for Core i7, the new Lynnfield processors have Turbo mode as well. It changed a little as there are several (five) steps in which the Turbo mode will be utilized.
Very simple: if one CPU thread is used only one processor core will automatically overclock in this order, Core i5 750 to 3.2GHz, the i7 860 to 3.46GHz and the i7 870 to an amazing 3.60GHz.
However look at the following image, if two threads are used on two cores, the Core i7 870 for example will then clock both cores at 3.4 GHz. And if there is massive CPU utilization on all four CPU cores, Turbo mode will still kick in at 3200 MHz (for the Core i7 870) on all active CPU cores.
So as you can see, Turbo mode now works in several configurations depending on load and multi-threaded applications. We like it very much, though you could also state that (example) the Core i7 870 advertised at 2.97 GHz really is a 3.2 GHz processor because that's its nominal processor speed with all four CPU cores maxed out, confusing... yeah we know.
But let's have a closer look at the architecture that defines Lynnfield... Nehalem.
We review the Core i5 3570K Ivy bridge processor. Will Ivy Bridge be the processor series everything you expected? Go find out in this extensive review here at Guru3D.
Core i5 2500K and Core i7 2600K review
Today we test and review Sandy Bridge, the Intel Core i7-2600K and Intel Core i5-2500K processors. We will pair the 2600K processor with the Intel Desktop Motherboard DP67BG and also run a test with the Intel Core i5-2500K processor on a Intel DH67BL motherboard
Core i5 655K and Core i7 875K processor review
Intel today releases two new processors targeted at a somewhat more enthusiast audience. Yes, processors for tweakers and overclockers. On socket LGA 1156 Intel now releases two K series processors. The 32nm Intel Core i5-655K processor has the very same specifications as the Core i5 650; it will operate at 3.2 GHz, will feature two cores with Hyper-Threading technology, sport 4MB of L3 cache and will be made using 32nm process technology. The difference between the 650 and 655K is the unlocked multiplier only. Then we have the enthusiast class Intel Core i7-875K processor, it has the very same specifications as the Core i7 870; it will operate at 2.93GHz, will feature four cores with Hyper-Threading technology, sport 8MB of L3 cache and will be made using 45nm process technology. The only difference between the two central processing units (CPUs) will be the unlocked multiplier on the 875K chip, which will allow overclockers and enthusiasts to easily boost clock-speed of the product without the necessity of overclocking other parts of their systems.
Core i5 650 - 660 and 661 processor review
The time has come for Intel to debut a new line of mainstream 32nm processors, which we have all learned to recognize under the codename 'Clarkdale', the new CPUs will be aimed at the mainstream desktop PC segment and will complement the chip maker's Core i3 and Core i5 line of products. The Intel processor lineup will include the Core i3 530 and 540 models, as well as the Core i5 650, 660, 661, and 670, which will be featured with Hyper-Threading, 4MB of L3 cache and support for dual-channel DDR3-1333 memory. Well, that and an integrated GPU as well of course. Guru3D will put the Core i5 650, 660 and 661 to the test.