Perfectly normal. Nothing to worry about.
This is deliberate design. Speedfan should allow control of the system fans. However, if you have a spare 80mm fan you can improve cooling quickly by attaching the fan directly to the heatsink. See below;
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As you can see, I have a red-led fan attached using aluminium tape. The fan is placed so that it is pulling air through the heatsink toward the back of the case. This is an older photo, but when this was done, CPU temps rarely peaked above 60C.
I now have it setup like this;
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View attachment 274907
View attachment 274910
With this config, even when soft-overclocked(using ThrottleStop & a Xeon W3680) to 4.13ghz and under full load, It stays right around 60C. Under normal conditions, the CPU rarely gets above 35C.
With that CPU, you'd be golden just adding a fan directly to the CPU heatsink.
Side note, that system can take much faster CPU's. For example, an X5675 or X5680 can be had for less than $35 and would improve your performance by a solid 30% to 40%. If you're in a part of the world that has easy access to amazon or ebay, it's an easy upgrade!