Why i7 Is Better Than i5?

kevhui

macrumors regular
Original poster
Apr 24, 2008
172
0
I saw all i7 have 1MB L2 cache and 8MB L3 cache, while i5 750 has the same L2 and L3, so why i7 is better?

Similarly, I saw Core 2 Quad Q9550/Q9650 has 12MB L2, so isn't it better?
 

iMacKeung

macrumors member
Nov 2, 2009
31
0
CPU is not all about the size of cache or clock speed....it's all about architecture of the system

and also i7 has hyperthreading, which i5 doesn't, it should perform better in multi-threaded programs
 
Comment

spinnerlys

Guest
Sep 7, 2008
14,328
7
forlod bygningen
Comment

kevhui

macrumors regular
Original poster
Apr 24, 2008
172
0
Thanks for your information.

I thought hyperthreading is not a new technology, and real number of cores should be better than hyper?
 
Comment

iMacmatician

macrumors 601
Jul 20, 2008
4,249
55
Thanks for your information.

I thought hyperthreading is not a new technology, and real number of cores should be better than hyper?
Two physical cores are better than one physical core HyperThreaded for two virtual cores. However, two physical cores are not better than two physical cores HyperThreaded for four virtual cores.
 
Comment

macchiato2009

macrumors 65816
Aug 14, 2009
1,258
1
i7 is better than i5 because marketing says so :D :rolleyes:

and i can predict the future...


i9 will be better than i7

i5 better than i3
 
Comment

Scott6666

macrumors 65816
Feb 2, 2008
1,331
468
Does anyone know if i7 will be sold out of the stores? It seems to be a BTO option off the i5 from the website. Usually this means not in stores. Given all the interest though I thought maybe...
 
Comment

morficus

macrumors member
Oct 26, 2009
72
0
North East, USA
I saw all i7 have 1MB L2 cache and 8MB L3 cache, while i5 750 has the same L2 and L3, so why i7 is better?

Similarly, I saw Core 2 Quad Q9550/Q9650 has 12MB L2, so isn't it better?
i5 does not support hyperthreading while the i7 does (hyper-threading = 2 execution threads per core, in place of 1)

Core 2 Quad does not have a level-3 caching (read a bit about cache levels if you're not clear on how L1, L2 and L3 cache differ from one another). But from what I remember from my schooling: bigger cache = harder to manage and can become ineffective (that's why L1 cache is so small but darn fast, while L3 is bigger but slower)

also, i5 and i7 don't have a FSB so some of the memory communication overhead has been eliminated (since it's built in to the CPU now)


CPU is not all about the size of cache or clock speed....it's all about architecture of the system

and also i7 has hyperthreading, which i5 doesn't, it should perform better in multi-threaded programs
+1
the days of cache size and clock speed are long behind us. the paradigm has shifted to multi-threading and memory management.

Simply put, 7 > 5.
Does anyone know if i7 will be sold out of the stores? It seems to be a BTO option off the i5 from the website. Usually this means not in stores. Given all the interest though I thought maybe...
nope, no i7's will be in retail stores - only base i5's
simply because it's a BTO option for the i5 (which you already pointed out)
maybe the the future, but not now at least
 
Comment

53x12

macrumors 68000
Feb 16, 2009
1,544
4
what a miss-leading title...
just to clarify: they both have 4 cores - but with hyper-threading the i7 has 8 execution threads (or virtual cores I suppose) while the i5 have 4 execution threads

I agree, the title sucks. However other members posted good info that is worth reading and will be rehashed in this one.
 
Comment

Indyrs2

macrumors newbie
Feb 18, 2008
22
0
Also with the i7 you get to see this in istat when you handbrake a movie. A thing of beauty.

 
Comment

DavieBoy

macrumors 6502
Jan 8, 2009
421
0
New Jersey
Does anyone know if i7 will be sold out of the stores? It seems to be a BTO option off the i5 from the website. Usually this means not in stores. Given all the interest though I thought maybe...
I was told that it will not be sold in stores. I however can not imagine them not selling it in stores. Don't most of us walk into the apple store wanting the best. I want the best so I have to wait 2 weeks?
 
Comment

IgnatiusTheKing

macrumors 68040
Nov 17, 2007
3,652
0
das Fort
I think this article (previously linked to by spinnerlys) provides a pretty good comparison of the two. It seems that most people won't really notice the difference between i5 and i7, but if you're working with video a lot, you will.

One thing I've not been able to find anywhere is a good list of programs that utilize hyperthreading. I'm leaning heavily toward the i5, but if I was to be assured that the Adobe CS Design suite (Photoshop, Illustrator, InDesign, etc.) was going to make use of HT in CS5, I would seriously consider going with the i7.
 
Comment

emptyCup

macrumors 65816
Jan 5, 2005
1,482
1
It does not compare the i5 to i7 .... so
From the fine print of the BearFeats article:

We haven't forgotten to answer the question, "What about the iMac Core i5?" Geekbench 64 bit results posted on the Geekbench Browser indicate that the Core i7 is 35% faster. Until we can get our hands on a Core i5, we can only hypothesize that it is worth the paying 10% more for the Core i7 to get 35% more CPU crunching power.​

Hope this helps.
 
Comment

Similar threads

  • Darajavahus
3
Replies
3
Views
328
Replies
6
Views
930
Replies
1
Views
639
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.