Sign in with
Sign up | Sign in
Your question

So what does it mean to get an C0 Stepping instead of D0?

Last response: in CPUs
May 11, 2009 8:16:25 PM

I'm going to be ordering an i7 system and have been reading about the whole D0 stepping from newer chips. Since I cannot guarantee in Canada a D0 stepping chip anywhere except for NCIX and they're about $60 more for that, what does it mean if I end up getting a C0 chip instead?

That I won't be able to OC above 4ghz on air? If I'm only concerned about doing a mild overclock say 3.2-3.6 then will a C0 do just fine?

More about : stepping

May 11, 2009 8:55:44 PM

I guess that's what I was wondering if it is more hype than something to truly pay extra $$$ for.
May 11, 2009 9:23:39 PM

The D0 usually overclocks farther and stays cooler than the C0 chips. Of course, there are those people who get lucky with their C0s and get great OCing out of them.
Related resources
May 11, 2009 9:30:56 PM

If you are worried wait a couple of weeks till the inventory can turn over and also make a call to the vendor and ask about the specs of the cpu you want to order.
May 11, 2009 9:33:35 PM

Fortunately I'm never in a rush to make large purchases like this so I can certainly wait. I tried calling direct canada today but they basically told me they can't check stock like that. Would have to try a smaller mom&pop store.

It certainly sounds like the D0, performance wise, is a better choice to wait on...cooler and higher oc's? that sounds good.
May 11, 2009 10:12:52 PM

What is your location? If you are within a reasonable distance of one of the Canada Computer stores in Ontario, they will normally let you check their stock for a specific stepping if you are in the store, but possibly won't do it over the the phone.
May 12, 2009 12:28:07 AM

Actually I'm in Kitchener so just a stones throw away from the Waterloo location. Now just so I got this covered...what are the indicators for a D0 stepping 920? (what should I look for)
May 12, 2009 3:57:30 AM


People need to learn to use google or something...
May 12, 2009 9:53:34 AM

Thank you rgsaunders.
May 12, 2009 2:32:26 PM

X-Nemesis, I'm in the same boat as you. If you buy it from, you might get a D0. We did a three weeks ago and got one.

Newegg doesn't have a warehouse yet in Canada, so shipping is done via USA warehouses, which are more likely to have sell all thier C0.

The price is good too.
May 12, 2009 3:57:03 PM

Yeah KBits...I'm going to go to Canada Computers today and take a look myself...but Direct Canada has the best price in Canada atm for $355...but again, no way of knowing if it's D or C.
May 12, 2009 7:48:48 PM

companys like sell both C0 and D0 and you can choose the one you want, the D0 ones are a bit more expensive tho
May 12, 2009 8:20:26 PM

^ they don't sell C0's anymore, they run out I think because they sold them at £225 each.
July 29, 2009 4:12:19 PM


This isn't regarding a Core i7 but instead a Xeon... I've just bought a couple of Xeon E5520's (to build a server platform) from two different vendors, one specifically said it had a C0 stepping, the other one is unknown... do you think I could have problems if the other processor turns out to be a different stepping?

July 29, 2009 5:14:11 PM

^ all Nehalem xeon's are D0's.
July 29, 2009 7:51:55 PM

Could it be a engineering sample? I bought it from ebay, and the vendor emphasized the C0 stepping.