Intel Core 2 Duo and Intel i5 Speed help

S

soulintake

New Member
Okay I have a question that I can't find the answer to. Why does the dual-core Intel Core 2 Duo have fixed speeds...i.e. a constant 2.8MHz in both single and dual core modes, and the dual-core Intel i5 have variable speeds...i.e. 2667-3200MHz (3.2MHz in single core mode and 2.6Mhz in dual-core mode)? What gives? Thanks!
 
Yes I know that, but an Intel Core 2 Duo runs at 2.6MHz in Dual Mode, and the Core 2 Duo runs at 2.8MHz in Dual mode. So why does the i5 take a performance hit from 3.2 in single mode to 2.6 in dual, and the core 2 Duo doesn't take a performance hit at all?
 
its like a turbo boost. if its a single threaded app thats demanding than intel will take the performance from the second core and use it to boost the first.so its 2.6 normal(daul core) and 3.2 in turbo mode.if thats what you mean.
 
It doesn't take a hit, it boosts itself up. If I understand what you're asking, and I'm not sure I do anymore :P The i series doesn't take a hit, but rather a gain. It's the equivalent of the C2D running one core at 3.2 say, instead of 2.8/2.6/whatever. Granted this will only happen when there is only one core in use. In applications that use only one core, the i series can take some of the leftover power from the idle core and boost the other to perform the task faster. Does this clear anything up or have I missed the mark entirely.
 
I'm under the impression that say even for the

i7: (2630QM 2.2-2.9GHz) that in single core mode it runs at 2.9GHz, Dual-Core ~2.55, Quad-Core 2.2GHz....

i5: (560M 2.6-3.2 GHz) Single Core: 3.2GHz, Dual Core 2.6 GHz

Core 2 Duo (2.8GHz): Single AND Dual core modes both at 2.8 GHz


So question #1...... is this correct?

Question #2... is the i7 in Dual Core mode (2.55 GHz) slower than the i5 (2.6GHz) in Dual-Core mode?

Question #3: And why wouldn't the Core 2 Duo be faster than both in dual core mode?
 
soulintake said:
I'm under the impression that say even for the

i7: (2630QM 2.2-2.9GHz) that in single core mode it runs at 2.9GHz, Dual-Core ~2.55, Quad-Core 2.2GHz....

i5: (560M 2.6-3.2 GHz) Single Core: 3.2GHz, Dual Core 2.6 GHz

Core 2 Duo (2.8GHz): Single AND Dual core modes both at 2.8 GHz


So question #1...... is this correct?

Question #2... is the i7 in Dual Core mode (2.55 GHz) slower than the i5 (2.6GHz) in Dual-Core mode?

Question #3: And why wouldn't the Core 2 Duo be faster than both in dual core mode?
Click to expand...

#1 - No. The i72630QM is always a quad-core (unless you disable some cores in the BIOS), the variable speeds are done by an Intel technology called turbo boost, basically the more CPU intensive the application is the more it will boost itself to attempt to cope up to a certain amount (2.9GHz in this case)
#2 - there isn't a dual core mode
#3 - The C2D is slower than both the i5-560 (which is a dual core, always is) and the i7. The C2D is a dual-core. No modes.

EDIT: However, if the app only takes advantage of a single core, then the rest will still be there, but left idling
 
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