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February 20th, 2025 10:59
Replacement processor i7-7700 (non K) in Dell Precision T3420 doens't reach Turbo Frequency
I recently replaced the Xeon 1240v5 for a i7-7700 in my Precision T3420 and the new processor doesn't reach the maximum boost speed of 4.20Ghz. It won't get past 3.90Ghz. It looks like the multiplier is stuck at 39x (see attached screenshots of CPU-Z). In the Bios Intel Turbo Boost, Speedstep, All cores and C states are enabled. What could be wrong? What could I have missed?
Any tips/pointers are welcome and appreciated 
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ejn63
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February 20th, 2025 12:26
Max turbo frequency requires disabling all but one CPU core -- have you done that?
JOH73
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February 20th, 2025 13:36
No I didn't, but did try a single core bench test in CPU-Z and still not exceeding 3.90Ghz. Haven't disabled cores in the Bios.
Did saw this online:
https://hwbot.org/xtu/analyze/3948055
And
https://hwbot.org/xtu/analyze/3614232
With information on the processors from other users. It states that the Xeon has the following Processor Turbo ratios:
1 Active Core 39.0 x
2 Active Cores 39.0 x
3 Active Cores 38.0 x
4 Active Cores 37.0 x
And the i7-7700
JOH73
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February 20th, 2025 13:39
Same is to see in Throttlestop by the way:
JOH73
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February 20th, 2025 13:58
On this link https://www.techpowerup.com/forums/threads/i7-7700-non-k-is-not-hitting-4-2ghz.233283/ a user posted the following screenshot:
And his (or her) multiplier in GPU-Z is (8-42) as I think it should be, but why isn't mine??
(edited)
JOH73
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February 20th, 2025 16:55
Solved! Pfffff...
Should have done that in the first place...
Techgee
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February 20th, 2025 18:18
@JOH73 , I went through a similar experience upgrading a CPU. Similar resolution as yours - and took me a while to figure it out. But in my case Turbo wasn't fully implemented in BIOS - used ThrottleStop to partially compensate.
Thanks for posting. I use HWiNFO all the time, but was unaware that hovering over Turbo would show current Turbo configuration (#cores and multiplier). Learned something new there.
Also, ThrottleStop screenshot you posted seems to allow configuring per core count Turbo configuration, which also is new to me. I'll have to re-visit latest ThrottleStop.