Retail Sandy Bridge not for hardware enthusiasts ...

Being in 'the loop' has its advantages. More often than never, I find overclocking results/rumours in my mailbox indicating the capabilities of upcoming products; in this case Sandy Bridge. One of the things I regularly found reported was the strange behavior of the upcoming CPUs; rather than being limited in terms of overclocking capabilities, these samples were limited by CPU multiplier.

This is what I found on a forum recently:

The x47 multiplier is the maximum, this retail has the same problem as the ES: they are limited to a frequency and will not do more than this limit. The limit is different on every CPU

...

Yeah, some can do only x46 and some can do more. The 2600K D1 sample what I had did x51 as maximum, the best i5-2500K ES I had did x48. I don´t know what it is, you can boot also higher multipliers but at the windows loading screen the system freeze if a multiplier isn´t working.

...

I tested 8 2500K CPUs (1 retail and 7 ES) and all had a limit that doesn´t depend on voltage or cooling. For example, one sample can do 4800MHz (48x100) but can´t boot 4809MHz (48x100,2). And this can also not boot at x49 multiplier etc. I don´t know if it is a bios or cpu bug, but all cpus have a specific limit. ask the other guys that test the ES CPUs, they´re tell you the same. Btw, I tested also one with LN2 @ 1.6v VCore but no difference; reached same clock as on air!

In reports, people related the multiplier issue to the ES samples being locked by Intel. Turns out ... retail Sandy Bridge has the exact same issue. Ironically, the K-sku is said to be 'unlocked' for overclocking; with no scaling under cold by CPU ratio-limit I'd argue the term unlocked cannot really be applied here ...

In any case, this particular retail sample can run 4.7GHz:

- Chrisch's 3DMark06 32576 marks with 2x GeForce GTX 460 (256bit) at 925/1025MHz
- Chrisch's 3DMark Vantage - Performance 29257 marks with 2x GeForce GTX 460 (256bit) at 925/1025MHz


26

Belgium Massman says:

Limited to air cooling, limited by CPU ratio, the known BCLK problems ruling out insane memory clocks. Ogay ... :(

Belgium Teemto says:

I propose a minute of silence for all benchers who will be using intel Sandy Bridge :-)

Czech Republic Aerou says:

I honestly hope for a workaround. This way, Intel might be forcing us into another platform without such limitations. Most of all, it is sad, because Sandy Bridge can kick some serious arse with respect to it's clocks.

United States Chuchnit says:

Same story for 2600k? I could see intel giving higher multi's for 2600k to steer buyers to the higher cost sku.

Germany Hyperhorn says:

Has anybody seen Sandy Bridge clock frequencies > 5.1 GHz already? Depending on the setup the limit seems to be between 4.7 and 5.1 GHz, so anything above 5.1 GHz might be helpful for understanding what causes the blockade at the mentioned clock frequencies.

Belgium Massman says:

This multiplier problem isn't really 'odd' per sé; we all remember the problematic odd multiplier syndrome on the 45nm Nehalem chips and the more-than-once note in an OC-thread that a certain chip goes higher with a specific multiplier (eg: 31x and 33x). If only the BCLK would go higher than what people have been reporting so far, there would be room to play. Sadly enough, Intel apparently decided they don't need DMI:PEG dividers on LGA1155.

Belgium Massman says:

Hyperhorn said: Has anybody seen Sandy Bridge clock frequencies > 5.1 GHz already? Depending on the setup the limit seems to be between 4.7 and 5.1 GHz, so anything above 5.1 GHz might be helpful for understanding what causes the blockade at the mentioned clock frequencies.


I was shown a 5.3G shot today:


United States Linuxfan says:

Looking forward to 990x :D Sandy bridge might be a nice low cost gamers option?

Germany Hyperhorn says:

Sure, with an extended BCLK range it would be easier to bypass certain multipliers or not exceed a certain number, but even within a small BCLK range of - let's say 10 MHz from 95 to 105 MHz - you can try some settings and compare. For example if you can bench everything you want to at 100 x 49, 100 x 48, 100 x 47 etc. and 95.0, 95.1, ... 104.9, 105.0 MHz BCLK with every mutliplier as long as you don´t exceed 4900 MHz core frequency in total, wouldn't you think you could at least boot your OS at e.g. 102.5 x 48? btw I'm surprised CPU-Z 1.56 doesn't show Name/specification/Revision on the vr-zone screenshot as it should recognize Sandy Bridge (ES and retail) pretty well. Do you have just the screenshot at hand or a link with more details included?

Germany SeLecT says:

My 2500K was limited at multiplier 48 too. But with BCLK OC i can reach 4930MHz as Maximum. This all was done with air cooling. I hope that some changes in the bios will fix the problem. 4,7GHz LinX stable at air is nice, but for benching it is poor. http://valid.canardpc.com/show_oc.php?id=1531963

Germany Chrisch says:

@ Massman i think some CPUs can do much higher multipliers, but all guys i know who have or tested sandy bridge are limited to max. 5.1GHz. The screen of 5.3GHz is nice but i think you need to test a few CPUs to get one which reach a high frequency :(

Indonesia Lucky_n00b says:

I just got my retail 2600K, and I confirmed that this CPU got the exact some problems as their ES Counterpart...Fully Stable 100x48 @ 1.35V, 3DMark Vantage stable @ 100x49 @ 1.5V (need VCore boost a lot to get 4.9Ghz), but cannot even boot at 100x50. Tried LN2, CBB around -120, CB around -130, but the clock limitation REMAIN the same. The 5Ghz wall is unbreakable even using xtreme voltages... The only difference I found when benching with LN2 is the BLCK. on air I get 104Mhz, but in LN2 I got 110Mhz. But it is pretty useless anyway, since the CPU Clock doesn't budge at all! Tested this 2600K with 4 motherboard (MSI,Gigabyte,ASUS, and Intel), and they're the same... Sandy Bridge = The End of Extreme Overclocking?

Norway knopflerbruce says:

3 letters: AMD :D

K404 says:

This is really disappointing. Intel have (maybe accidentally) limited an architecture with so much potential. Only of use for CPU category benching?

Belgium Massman says:

Accidentally? I would assume Intel's engineers to be the best you can find in this area of expertise :)

K404 says:

45nm C0 C2D: Internal temperature sensors rolled over at silly temperatures. Chip thought it was too hot and shut down. Some had mis-calibrated sensors and could be used under cold. No, Intel never make mistakes or get things wrong

TaPaKaH says:

so Massman, you still think this will get the 1M record? :D

Germany Chrisch says:

update on this cpu with new mainboard (Intel DP67BG with new bios)




so i think the old bios on the ASUS is the problem :(

Belgium Massman says:

Oh?

New bios is solving things?

//edit: can you upload the bios so 'other' *wink* people can test? :D

says:

Not sure I am seeing much improvement to be quite honest. 5.1GHz and small change was the max before and now it is 5.198GHz.

Germany Chrisch says:

Massman said: Oh?

New bios is solving things?

//edit: can you upload the bios so 'other' *wink* people can test? :D

sorry i am not allowed to share the Intel Bios :(
1Day said: Not sure I am seeing much improvement to be quite honest. 5.1GHz and small change was the max before and now it is 5.198GHz.

no, before was it 4.78GHz on the ASUS and now 5.2GHz on the Intel but i don´t think that 5.2GHz is the limit ;)

but i don´t want to give the CPU more vcore on aircooling!

Btw 32M aircooled


K404 says:

I think that new BIOS means i've pwned Massman 3 times today :D:D:D

Germany SoF says:

Chrisch said: update on this cpu with new mainboard (Intel DP67BG with new bios)




so i think the old bios on the ASUS is the problem :(


EPIC WIN! yeah chrisch proves everybody wrong another time :D

Germany Chrisch says:

~5.3GHz 1M @ air :)

says:

Chrisch said: ~5.3GHz 1M @ air :)


1.6 Volts :D:D:D on air. And 1.068 Volts for 4.9GHz :p Crazy:cool:

Germany Chrisch says:

1.068v for 4.9GHz is impossible, thats only a CPU-Z bug ;)

Please log in or register to comment.

Leave a Reply: (BBCODE allowed: [B], [QUOTE], [I], [URL], [IMG],...)