i7 620M vs. 720QM

Thanks... I know that, but what I meant is that I'm not sure, how the OS will behave, if I limit it to use only 2 out of 8 cores. Since the setting in msconfig refers to logical cores (or threads), when I set it to use 2 cores, I expect it to use in fact 1 physical core, however, I'm guessing it might as well use 2 physical cores - 1 thread per each, e.g. core 0 & core 2 (or core 1 & core 3)... I hope not. Well, it's just a thought.

 

What are the turbo mode freq for the 720qm ?
i know when all 4 core are loaded, its 1.6 and 2.8 when one core is loaded.
When 2 cores are loaded is it lower than 2.8 ?

Isn't there a turbo mode with all 4 cores loaded ?

Could you specify the turbo modes comparatevly of the 840qm ?

 

720QM - base: 1.6 Ghz - turbo: 1/1/6/9
840QM - base: 1.87 Ghz - turbo: 2/2/8/10

Turbo describes the available frequency bins (+133 MHz) of Intel Turbo Boost Technology that are available for 4, 3, 2, 1 active cores respectively.

Do the math by yourself. More here...

 

From Wikipedia, take a look at this link. What you want is the "Turbo" column, which lists the maximum turbo-boost on 4/3/2/1 cores. Each turbo boost step is 133 MHz, or .133 GHz, so for the i7-720QM, it would be 1.73/1.73/2.4/2.8 for 4/3/2/1 cores, and for the i7-840QM it would be 2.14/2.14/2.93/3.2

 

SO here are the multipliers:
Core i7 620m; Base 20, Turbo 3/5
Base=20; 2660
1xCore=25; 3325
2xCore=23; 3059

Core i7 640m;
Base=21; 2793; Base 21, Turbo 3/5
1xCore=26; 3458
2xCore=24; 3192

Core i7 720qm; Base 12; Turbo 1/1/6/9
Base=12; 1596
1Core=21; 2793
2xCore=18 2394
3,4xCore=13 1729

Core i7 740qm, 1 multiplier more Base 13; Turbo 1/1/6/9
Base=13; 1729
1Core=22; 2926
2xCore=19 2527
3,4xCore=14 1862

Core i7 840qm: Base 14; Turbo 2/2/8/10
Base=14; 1729
1Core=24; 3192
2xCore=22 2926
3,4xCore=16 2128

Now i can clearly see how a core i7 950, the base line cpu in the x7200 is oh so much better than a 840qm.
The core i7 950 has 3.02 GHz on all 4 core as baseline.

The 950: Base 23, Turbo 1/1/1/2

Even Sandy Bridge desktop Cpus are beneath it. We can see here why the TDP of the destop model is bigger, because non turbo freq is high allready. And the mobile models benefit more from the turbo mode.

 

Dell Alienware M17x10 - Buy from Microsoft Store

2000$ only today Ultimate PC Gamer Holiday Bundle - PC + Black Ops +Flight Simulator + Sidewinder X8 Mouse + Free Zune HD 16 GB
Display
17.0 in WideXGA+ dual CCFL backlit (1440 x 900)
Processor
Intel Core i7-740QM 1.73 GHz, L2 cache 6 MB
Memory
8 GB DDR3 1333 MHz
Hard drive size
1 TB SATA 7200 RPM
Operating system
Windows 7 Home Premium
PC type
Notebook
Optical drive
Slot-load Blu-ray Disc (BD) combo (reads BD and writes to DVD/CD)
Media drive
8-in-1 memory card reader
Audio
High-Definition 5.1 Surround Sound
Video
ATI Radeon HD 5870 with 2 GB graphics memory
Ports
4 hi-speed USB 2.0
HDMI
eSATA/USB 2.0 combo (2-in-1)
Headphone output
Microphone input
VGA (15-pin)
DisplayPort
FireWire (IEEE 1394a, 4-pin)
Express card slot
Battery
9-cell lithium-ion (3.4 hours)*
Camera
Integrated webcam
Wireless
Dell 1520 WLAN card
Bluetooth
Yes
Dimensions
15.98 x 12.65 x 2.11 in (405.89 x 321.31 x 53.59 mm)
Weight
11.68 lbs (5.29 kg)
Color
Space Black
Other
For more technical specifications, please see manufacturer's website.

 

Good thread: im currently trying to choose between the i7 620m and the i7 720qm.

I want to be able to play GTAIV on it though reading this thread makes me think the the 620m isnt an option.

However I stumbled across this youtube video of someone playing GTAIV on a lower clocked i5 model (the i5 520m I believe) with the exact same laptop as the one im looking at and he seems to be getting OK frame rates, so now im confused.

I only really need to run it on 720p res and not full HD.

Here is the video:

YouTube - Gta 4 high/very high on vaio e series ea16 5650

 

I don't know what that video is supposed to be showing (sorry, I don't game), but make sure that the minimum FPS is (far) above 30 for it to be playable for you.

The avg FPS doesn't give you enough information to make a good decision and a higher avg can in fact be a worse performer when the minimum is taken into consideration.

 

I don't play GTAIV, so I'm not sure if the level that he was playing was representative, but I did notice that there didn't seem to be a whole lot going on in the area that he was playing in. If his framerates are like that in a relatively uncrowded, low-action area, I have to wonder how bad things would get in a busier area with lots of things going on (police chasing you, bullets flying, that sort of thing). You also can't really tell if there's any sort of lag between input, as in, even if it looked smooth, it might be because the player has already gotten used to the fact that there's a half-second lag between whatever he does and what happens on screen; it might explain his wild driving a bit. Or maybe he just drives like that normally.

 

you kidding me?? This guy is getting 22fps and i used to play at those fps and its extremely uncomfortable.

 

That deal isn't that good...and the screen resolution sucks for 17" 1440x900?

I'd rather get an ASUS G73 with GTX 460M and 740QM

 

Can someone fill in the blanks (for the i7 820qm):

Core i7 820qm: Base ; Turbo / / / /
Base=
1Core=
2xCore=
3,4xCore=

 

It's the same as an 840QM, with 1 less multiplier at all levels, so

Core i7 820QM: Base 13; Turbo 2/2/8/10
Base = 13; 1729
1xCore = 23; 3059
2xCore = 21; 2793
3,4xCore = 15; 1995

Note that the base for the i7-840QM is wrong; it should be 1862.

 

How much battery life can I expect to save between a i7 640 (35w) and an i7 820 (45w)? While surfing the web for example.

 

the i7-640 will probably pull more than the i7-820qm under load.. notebookcheck actually tested this... the i7 should cause your battery life to be about 10-30% less than i7-640.. so if it was 2hrs , you should loose 30 mins or so.

Panther214

 

How about the i7-820QM?

When using 2 and 4 Cores?