- Jan 19, 2012
- 16
- 0
- 18,510
[Full parts list at bottom]
Hello. I've been building a PC for a friend out of a collection of new and reused parts (the used ones only lightly so, and by me personally). After getting the system assembled, I began running stress tests on it to weed out DOAs and other hardware flaws. The initial stress testing showed something that had me briefly concerned: Cores 0, 2, and 3 all ran at the expected temperatures. Core 1 ran 5-10C higher. A quick bit of searching indicated that this was not uncommon on Ivy Bridge, and generally just considered a sensor flaw on the one core. IBT 100+ passes, Prime95 small FFT for 12 hours, and lastly P95 blend with high RAM usage were the tests used.
The problem cropped up on the final test to be run, P95 Blend. The same core that ran abnormally hot also threw a fatal error after 3h50m~3h58m. Five times. This core, on further observation, also runs about 3 test sequences behind the other three cores. Ideally, it will be overclocked very mildly to 4.2GHz, but I'm also running the tests at stock settings. It's currently in the midst of a test.
In addition, the CPU as a whole seems to be extremely sensitive to voltages. There is an abrupt rise in temperature to 101C on that core if voltage exceeds 1.25V (CPU-Z). I have been working to keep it at 1.20V (CPU-Z) under load which drops the temperatures to 71-78C on that particular core.
This "touchy" core makes me wonder if I've got a borderline lemon on my hands. This would be the first time in all the years and times I've built multi-core CPUs where one of the cores was less than fantastic. Even at stock, that hot core worries me, now that it's also the one demonstrating failures. That it may well not be just another expected sensor error.
Does anyone have any more educated opinions on the matter? Should I attempt to exchange it for another with Newegg? This has to be the PC that my friend will likely use for the next 3 to 5 years. It is a very large, important purchase for him and will be his only PC.
CPU: i5 3570K [New]
MB: Gigabyte Z77X-UD4H [New]
RAM: G.Skill F3-12800CL9D-8GBRL [New]
HSF: GeminII S524
HDD: WD Caviar Black, 1TB [Lightly used]
PSU: Corsair TX650 V2 [Lightly used]
GPU: RHD 5770 [Lightly used, will be replaced with a non-bottleneck solution as funds permit]
Case: Antec 300
Optical: ASUS DVD+/-RW
Hello. I've been building a PC for a friend out of a collection of new and reused parts (the used ones only lightly so, and by me personally). After getting the system assembled, I began running stress tests on it to weed out DOAs and other hardware flaws. The initial stress testing showed something that had me briefly concerned: Cores 0, 2, and 3 all ran at the expected temperatures. Core 1 ran 5-10C higher. A quick bit of searching indicated that this was not uncommon on Ivy Bridge, and generally just considered a sensor flaw on the one core. IBT 100+ passes, Prime95 small FFT for 12 hours, and lastly P95 blend with high RAM usage were the tests used.
The problem cropped up on the final test to be run, P95 Blend. The same core that ran abnormally hot also threw a fatal error after 3h50m~3h58m. Five times. This core, on further observation, also runs about 3 test sequences behind the other three cores. Ideally, it will be overclocked very mildly to 4.2GHz, but I'm also running the tests at stock settings. It's currently in the midst of a test.
In addition, the CPU as a whole seems to be extremely sensitive to voltages. There is an abrupt rise in temperature to 101C on that core if voltage exceeds 1.25V (CPU-Z). I have been working to keep it at 1.20V (CPU-Z) under load which drops the temperatures to 71-78C on that particular core.
This "touchy" core makes me wonder if I've got a borderline lemon on my hands. This would be the first time in all the years and times I've built multi-core CPUs where one of the cores was less than fantastic. Even at stock, that hot core worries me, now that it's also the one demonstrating failures. That it may well not be just another expected sensor error.
Does anyone have any more educated opinions on the matter? Should I attempt to exchange it for another with Newegg? This has to be the PC that my friend will likely use for the next 3 to 5 years. It is a very large, important purchase for him and will be his only PC.
CPU: i5 3570K [New]
MB: Gigabyte Z77X-UD4H [New]
RAM: G.Skill F3-12800CL9D-8GBRL [New]
HSF: GeminII S524
HDD: WD Caviar Black, 1TB [Lightly used]
PSU: Corsair TX650 V2 [Lightly used]
GPU: RHD 5770 [Lightly used, will be replaced with a non-bottleneck solution as funds permit]
Case: Antec 300
Optical: ASUS DVD+/-RW
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