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which processor


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#1 FayB

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Posted 25 March 2010 - 04:12 PM

I am planning on getting a new computer before long. I think I am going to get either an hp180t or hp170t.
One of the main differences is the processor. The hp180t has the i7-9 series and the hp170t has the i7-8 series.

I found a comparison list and it appears there are 2 main differences.
The i7-8 series has bus speed of 2.5 GT/s DMI and has Intel Trusted Execution Technology.
The i7-9 series has bus speed of 4.8 GT/s QPI and does not have Intel Trusted Execution Technology.

The bus speed of the -9 series looks faster but I don't know how to compare QPI and DMI.
Aldo I don't know how valuable the Trusted Execution Technology would be.

Any suggestions?

Thanks,
Fay

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#2 ReviverSoft

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Posted 25 March 2010 - 09:00 PM

Why you should choose the the 9 series over the 8 series:

1. Supports Triple channel memory configuration
2. Higher bus speed (4.8 GT/s QPI)
3. Better suited for overclocking
4. Better suited for multiple- GPUs

However, if the above points don't matter to you, the 8 Series is a good choice, offering marginally lesser performance and consuming lesser power.

Good luck!

Edited by ReviverSoft, 25 March 2010 - 09:01 PM.

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#3 FayB

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Posted 25 March 2010 - 09:18 PM

Riversoft,

How does QPI compare dto DMI?

Do you know anything about the Trusted Execution Technology? The 8 series has it, the 9 series does not, but I don't know if it would mean to me.

Fay

#4 ReviverSoft

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Posted 26 March 2010 - 08:58 PM

A CPU interconnect is a data path that has the bandwidth AND latency to handle CPU-to-CPU communication. In the case of Nehalem & Westmere, the CPU interconnect is QPI. Of course, this is only apparent when you see a multi-processor diagram:

Posted Image

In that diagram, each of the CPUs has two QPI channels, one going to the other CPU, and one going to the IOH. The QPI channel is a CPU interconnect, as it connects two CPUs. It is also capable of performing very well as an I/O interconnect, and that's its primary use in the Bloomfield, Lynnfield and Clarksfield CPUs. In the Arrandale & Clarkdale, the QPI connects the CPU to the memory controller, where the bandwidth and latency demands placed on it are similar to those of a CPU interconnect.

For DMI, the story is VERY different. EVERY transfer across that interface is either I/O traffic, or I/O management traffic. This is an I/O interconnect, and ONLY an I/O interconnect.

^ Hope that explains what QPI & DMI mean.

Simply put, the Intel Trusted Execution Technology isn't a necessity, more like a unique feature.

Edited by ReviverSoft, 26 March 2010 - 09:03 PM.

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#5 FayB

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Posted 27 March 2010 - 11:46 AM

I still don't really know how to compare the bus speed of the -9xx series with the bus speed of the -8xx series - since the bus speed of the -9xx series is listed as QPI and the bus speed of the -8XX series is listed as DMI.

But that is OK, I think I'll just go ahead and get one of the ones in the i-9xx series.

Thanks for the information

Fay

#6 nqzdepofltr

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Posted 11 August 2010 - 09:02 AM

If you are not going to use it very heavily I would get
an Intel i5.




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