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The Core 2 Quad Q8400: Intel's $183 Phenom II 940 Competitor
The Core 2 Quad Q8400: Intel's $183 Phenom II 940 Competitor
Date: May 7th, 2009
Topic: CPU & Chipset
Manufacturer: Intel
Author: Anand Lal Shimpi
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I’ve been writing about the “new” Intel for nearly three years now. It’s been so long that I almost forgot what the old Intel was like. It’s not that the old Intel wasn’t competitive performance-wise, it’s that the old Intel wasn’t pleasant to work with. The old Intel was the one that always thought the Pentium 4 was the fastest thing on the planet, even when it wasn’t. The old Intel wasn’t forthcoming with information and acted like it worked in a world where it had no competition. The old Intel wasn’t a very good Intel.

The new one is nothing like that. We get open sharing of information, real discussion about AMD’s strengths and weaknesses and it also helps that we also get the world’s fastest microprocessors with it.

We’ve seen that the new Intel can stand the test of time, at least over the past three years. But can the new Intel last when it’s not always winning reviews? Sure, Intel’s Core i7 remains untouched but what about at cheaper price points? Last month we found out that Intel is quite competitive at the $70 with its Pentium E5300. But between the $70 E5300 and the $280 Core i7-920 there are a few price points where AMD is recommendable.

The question then becomes how does the new Intel deal when it isn’t the fastest on the market?

Surprisingly well it turns out.

This is the Core 2 Quad Q8400:

It’s a quad-core chip running at 2.66GHz with a 2MB L2 per pair of cores (4MB total). It’s like two Pentium Dual Core processors on a single package.

These chips actually have a 6MB L2 but with 2MB disabled either because they have irrecoverable defects in the cache or simply to hit the right price point. In other words, the Q8400 is literally a Q9400 but with 2MB of its L2 disabled.

The Q8400 is Intel’s most recent response to the Phenom II X4 940. Initially AMD priced the 940 similarly to the Q9400. Then, Intel cut prices so that the 940 had to compete with the much faster Q9550. AMD responded, with a price cut that put the 940 on par with the Q9400 again.

Once AMD began shipping Socket-AM3 Phenom IIs, it dropped the prices on its Socket-AM2+ parts once more. This wasn’t so much a price cut but rather a gradual phasing out of the AM2+ CPUs, eventually I expect an AM3-only market since those chips can also work in AM2+ boards.

Rather than take the bait and drop the Q9400 prices once more, Intel instead responded with the introduction of a similarly priced Q8400 at $183.

AMD’s Phenom II X4 940 was generally the same speed if not faster than Intel’s Core 2 Quad Q9400. With less cache, the Q8400 shouldn’t perform any better than the Q9400, so the question is - does it perform any worse?

Then there’s power consumption to worry about and overclocking, but we’ll get to those in due time. Let’s just say that the situation is far more complex than it seemed at first sight.

Core 2 Quad Q9400 vs. Q8400: An Extra $30 buys you 6%   Next Page

 
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59 Comments - Last by enu73, 88 days ago
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no VT by 8steve8, 197 days ago
no Virtualization Tech... so no windows 7 virtual PC, no hyper-v...

that sucks.

rather go phenom 2, intel e8xxx or q9xxx

Reply
RE: no VT by GeorgeH, 197 days ago
+1

No support for Windows 7 XP Mode is the reason I chose AMD over an Intel Q8X00 in the PC I just built.

Reply
RE: no VT by leomax999, 197 days ago
Intel has announced vt support for Q8300, E7400, E7500, E5300, E5400.
So i dont see any reason why q8400 shouldnt get it.
http://www.tcmagazine.com/comments.php?shownews=25886&catid=2

Reply
RE: no VT by duploxxx, 197 days ago
oh great 2 versions of cpu just because of painfull wrong marketing decissions in the past.

way to go intel ....and what about all the other q8xxx series? or a full list of mobile cpu's

Reply
RE: no VT by Samus, 197 days ago
its just disabled in hardware, which means it can be re-enabled, just like cores can be re-enabled on phenom x3. just let someone figure it out. they will. they always do :)

Reply
RE: no VT by Roland00, 196 days ago
you can re-enable the Phenom II tri cores for they were disabled via software.

If the chip is disable via hardware (using a laser to disable parts of the chip) then there is nothing you can do to re-enable the chip. Then first generation Phenoms can't be re-enabled for it was disabled via hardware.

Reply
RE: no VT by JumpingJack, 167 days ago
Depends on how it is disabled. Fusing in a chip can be actual diabling of circuits or actual 1's and 0's that make the logic read by the BIOS at startup (such as CPUID), the CPUID then dictates from BIOS code feature sets etc. etc. that are enabled.

This is how quads arise from tri-cores and dual cores from AMD -- the core is not physically fused off/disconnected, rather the BIOS reads a certain CPUID and identifies it as 'a tri-core'. In such a case, features can be turned 'on' or 'off' simply by updating the BIOS.


Reply
RE: no VT by piroroadkill, 197 days ago
iirc amd-v is better than intel vt

Reply
RE: no VT by Anand Lal Shimpi, 196 days ago
You are very correct - Intel just informed me that the Q8400 has VT-x from the start. The other CPUs you mentioned will get VT in the latest versions but I don't believe it's retroactive. I believe it's a new silicon revision for those chips that enables it, but all Q8400s have it.

Take care,
Anand

Reply
RE: no VT by leomax999, 197 days ago
Intel has announced vt support for Q8300, E7400, E7500, E5300, E5400.
So i dont see any reason why q8400 shouldnt get it.
http://www.tcmagazine.com/comments.php?shownews=25886&catid=2

Reply
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