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Help w/ Computer Architecture HW Question Please

Gronnie

In the book we are given the following 3 equations:

"Energy ∝ CapacitiveLoad X Voltage^2 This equation is the energy of a pulse during the logic transition of 0 → 1 → 0 or 1 → 0 → 1.

The energy of a single transition is then Energy ∝ 1/2 X CapacitiveLoad X Voltage^2

The power required per transistor is just the product of energy of a transition and the frequency of transitions: Power ∝ 1/2 X CapacitiveLoad X Voltage^2 X FrequencySwitched"

The professor went on in an email that by power it means dynamic power.

If the problem is:

"The Pentium 4 Prescott processor, released in 2004, had a clock rate of 3.6 GHz and voltage of 1.25 V. Assume that, on average, it consumed 10 W of static power and 90 W of dynamic power.

The Core i5 Ivy Bridge, released in 2012, had a clock rate of 3.4 GHz and voltage of 0.9 V. Assume that, on average, it consumed 30 W of static power and 40 W of dynamic power.  

For each processor find the average capacitive loads."

My solutions are:

CL = DynamicPower / (0.5 X V^2 X ClockRate)

P4: CL = 90 / (0.5 * 1.25^2 * 3.6E9) = 3.2*10^-8
    
I5: CL = 40 / (0.5 * 0.9^2 * 3.4E9) = 2.90486565*10^-8

I think I might be off by a factor of 2 but I'm not sure? Is clock rate the same as frequency?

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Not sure about all of the work and stuff like that (it's way over my head) but I'm pretty sure that clock rate is the same as frequency.

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A CPU's frequency speed is the same as the clock rate, yes. :)

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I'm sorry but I just have to... :mellow:

The most common result of insufficient wattage is a paperweight that looks like a PC

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Actually, I did some more research and the clock rate is not the same thing as frequency in that equation. Clock rate is frequency X 2, because a Hz is a full cycle from 0 --> 1 --> 0 or 1 --> 0 --> 1.

SSD Firmware Engineer

 

| Dual Boot Linux Mint and W8.1 Pro x64 with rEFInd Boot Manager | Intel Core i7-4770k | Corsair H100i | ASRock Z87 Extreme4 | 32 GB (4x8gb) 1600MHz CL8 | EVGA GTX970 FTW+ | EVGA SuperNOVA 1000 P2 | 500GB Samsung 850 Evo |250GB Samsung 840 Evo | 3x1Tb HDD | 4 LG UH12NS30 BD Drives | LSI HBA | Corsair Carbide 500R Case | Das Keyboard 4 Ultimate | Logitech M510 Mouse | Corsair Vengeance 2100 Wireless Headset | 4 Monoprice Displays - 3x27"4k bottom, 27" 1440p top | Logitech Z-2300 Speakers |

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