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OC headroom, 920 vs 975

Post Date: 2009-08-20
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joema View Drop Down
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Posts: 19 		  Quote joema Quote  Post ReplyReply bullet Topic: OC headroom, 920 vs 975
    Posted: 20 Aug 2009 at 8:54am
I can buy a factory-OC'd i7-920 from DS that's supposedly stable at 4 Ghz, although that requires liquid cooling.

If that's so, why do DS customers buy processors like the 940, 950, or (especially) the EE 975?

If I were building it myself, the unlocked EE chip has easier overclocking options -- unlocked multiplier, etc.

But if DS builds it, they've already done the work and testing to ensure the 920 will OC stably at (say) 4 Ghz, if properly cooled. A 975 won't necessarily OC much beyond that.

The EE chips are much more expensive. DS offers them as a selection option, but I can't see why anyone buys them. Any comments?
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sirsiddius View Drop Down
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Posts: 441 		  Quote sirsiddius Quote  Post ReplyReply bullet Posted: 20 Aug 2009 at 10:06am
I think DS said they were working on an option for a 4.5 Ghz overclock on an 975, if they ever come through with that then there's a reason to buy one.

That aside the 975 is supposeldy cut from purer silicon, so I guess it would have lower operating temperatures, and better stability thought that stability is only apparent under extrmeme LN2 superclocking.
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 20 Aug 2009 at 11:01am
the 975's are higher binned chips, and for 24/7 setups, they offer very little over the 920's.
I have tried other variants of the i7, and for everyday computers, it is a no-brainier, take the 920.
 
If, and I do mean if, DS does give an option for 4.5Ghz it will be with hyper threading off, which in Vista, does not do much, especially in the way of gaming, but in Windows 7, having hyper threading on will show more improvements across the board.
 
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venom View Drop Down
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Posts: 0 		  Quote venom Quote  Post ReplyReply bullet Posted: 20 Aug 2009 at 10:53pm
That's interesting to hear you say that, I have noticed no difference with hyper threading on or off in Windows 7.

And I really doubt 975's are higher binned, I can hit 4.4GHz stable on my c0 920, and generally only 4.4GHz on the 975's (w/ hyper threading).
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 21 Aug 2009 at 1:30am
you must be a god to the the OC world!! I bow to such greatness.. It is amazing how all the i7 records are with 975's, but except for you, cause you must hold all the i7 records..  oh,, but wait, you hold, umm, zero, so newb that can't even post a legal vantage score must know all.   Yeah  windows 7 does not take any advantage of hyper threading, over Vista, sorry to post such nonsense in the presence of  knowledge encompassing as you. Smile Maybe that mask is clouding your supreme judgment. Star 
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venom View Drop Down
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Posts: 0 		  Quote venom Quote  Post ReplyReply bullet Posted: 21 Aug 2009 at 2:48am
I posted the vantage score, maybe it was taken down due to the NDA.  And you're right, I don't have any records, can't afford the insane LN2/DICE/Phase costs, nor the cost of an i7 975, or Classified board, or 1200w+ power supply.

The only OCing I do on those chips are at work, and that gives me very limited time, maybe 45 minutes if I am lucky.  What I should have said was generally 4.4GHz is the easiest to get, anything further requires patience and a lot of time.

Didn't say it was non-sense, just saying what I noticed with it on vs off... Maybe it does make a difference, but like I said, I haven't noticed any.

No need to be an asshole, nothing of what I said was said to be fact, if you notice all of the I's in the last post.  ;)
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venom View Drop Down
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Posts: 0 		  Quote venom Quote  Post ReplyReply bullet Posted: 21 Aug 2009 at 3:24am
How about you show some screenshots/benchmarks/whatever that proves Windows 7 takes advantage of HT.  I'd really like to see them and if the difference is worth me dropping my overclock to enable HT again.

Why not post some of your benches and overclocks that you have done, I'd like to see them as well.

Here's the Vantage screen shot you were asking for in that other thread: http://img268.imageshack.us/img268/7413/3dmarkvantagei78704ghzr.png
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venom View Drop Down
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Posts: 0 		  Quote venom Quote  Post ReplyReply bullet Posted: 31 Aug 2009 at 10:15pm
Still not able to show me anything?
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poppawoof View Drop Down
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Posts: 11 		  Quote poppawoof Quote  Post ReplyReply bullet Posted: 10 Sep 2009 at 12:10am
Is there a difference of how high you can overclock a 975 versus the 950 versus the 920? Can you over clock the 975 to 4.8 or 5.0 stable on a good watercooling system? Does anyone have any experience over clocking the 950? How high? I have not found much information on the 950. ThanksConfused
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venom View Drop Down
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Posts: 0 		  Quote venom Quote  Post ReplyReply bullet Posted: 10 Sep 2009 at 12:35am
The 950 has a higher _potential_ because of the 23x multiplier versus the 920 with a 20x multiplier, but nothing is guaranteed.  I haven't seen a 975 @ 5GHz Linpack stable yet, though anything is possible with the right cooling (chilled water or phase change for 24/7 use), patience, and a crapload of money.
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Sodius View Drop Down
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Posts: 613 		  Quote Sodius Quote  Post ReplyReply bullet Posted: 10 Sep 2009 at 10:09am
For the OC difference and the money difference I personally would pick the 920 everytime. The 975 just doesn't seem to be worth the extra cash. My opinion of course. :)
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 14 Sep 2009 at 2:14pm
Originally posted by venom

Still not able to show me anything?
Still waiting for you to post a legal score. Smile Not one that uses the GPU to calc most of the CPU's performance.Big%20smile
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venom View Drop Down
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Posts: 0 		  Quote venom Quote  Post ReplyReply bullet Posted: 15 Sep 2009 at 3:20am
Oh you should have specified that, i'll run one tomorrow on the i5.
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 15 Sep 2009 at 9:06am
lol, I did specify it, several times. Also in the benchmarks that I posted that you said were bullsh*t also specified it. Plus one should never need to specify posting a legal benchmark, always just post up legal scores. 
 But I might be a bit jaded since I never deal with benchmarks that I can't submit, hate having records denied. lol
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venom View Drop Down
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Posts: 0 		  Quote venom Quote  Post ReplyReply bullet Posted: 16 Sep 2009 at 12:05am
Ah, I don't have the cash for any crazy LN2 pots and 1500w power supplies with 2-3 high end cards so I don't usually bother with legal scores.  But yeah that makes sense, maybe that's why I thought the score was bullsh*t as well.
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